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P. K. Rajagopalan

P. K. Rajagopalan
Born1930/10/27
Mukteshwar, Kumaon division, Uttarakhand, India
Died29/04/2024
Chennai
Resting placeChennai
Other namesPylore Krishnaier Rajagopalan
Occupation(s)Vector control scientist, acarologist
Years active1952-1990
Known forVector Control programme in India
AwardsPadma Shri
Om Prakash Bhasin Award

Pylore Krishnaier Rajagopalan was an Indian vector control scientist, biologist and acarologist, known for his pioneering contributions to the control programmes against vector-borne diseases in India.[1] He was a former director of the Indian Council of Medical Research managed Vector Control Research Centre, Pondicherry.[2][3] He graduated in 1949 from the Banaras Hindu University and obtained a Masters in Zoology with University First Rank there itself in 1951.[4] In 1952 he joined the fledgling Virus Research Centre in Pune, and worked under the supervision of some of the finest vector control specialists such as Dr T Ramachandra Rao.[5] In recognition of his outstanding work as a young research scientist, in 1957 he was awarded a Fellowship by the Rockefeller Foundation to pursue a Master's program in Public Health from the University of California.[6] He went on to secure a Diploma in Acarology from the University of Maryland at College Park.[7]

He returned to India in 1960 and rejoined the Virus Research Centre where he was asked to lead the investigation into the mysterious Kyasanur Forest Disease in rural Karnataka.[8] His pioneering work on the role of migratory birds in spreading disease vectors as part of the investigation into KFD, conducted under the supervision of the ornithologist the late Dr Salim Ali, led to his doctoral degree from Pune University.[9]

He was then assigned as a Senior Scientist to the World Health Organization Project on Genetic Control of Mosquitoes in New Delhi, during which time he expanded the body of knowledge on mosquito population behaviour.[10] In 1975 he was posted to Pondicherry where he founded the Vector Control Research Centre - a research centre set up to study ecological control of vector borne diseases.[11]

The VCRC, under his leadership, contributed significantly to the control of Japanese Encephalitis in Burdwan District.[12] However its flagship achievement under the leadership of Dr Rajagopalan was to pioneer the technique of Biological Control, which combined minimal chemical intervention with environmental measures and the use of natural mosquito larval predators to bring down the incidence of diseases like filariasis. This was demonstrated spectacularly over five years in Pondicherry and Shertallai in Kerala.[13]

After his superannuation in 1990, he served the World Health Organization as a member of their steering committees on Filariasis and on biological control of vectors.[14] He is a fellow of the Royal Society of Tropical Medicine, UK[2] and is credited with several articles on vector control and acarology.[15][16]

Scientific Interests

Dr Rajagopalan has worked extensively on ecological aspects of vector borne diseases  for four decades on a variety of diseases in India. His academic interests are:

  • Japanese Encephalitis and its control in several states.[17]
  • On ticks and mites, small mammals, birds, and on the Epidemiology of Kyasanur Forest Disease.[18]
  • Genetic control of mosquitoes.[19]
  • Integrated vector control  methods with community participation to control Bancroftian Filariasis in Pondicherry.[20]
  • Elimination of Brugian Filariasis in Shertallai.[21]
  • Control of Island Malaria in Rameswaram and urban malaria in Salem.[22]
  • Malaria control in the coastal villages of Pondicherry and in tribal areas of Orissa.[23]

Education

Dr Rajagopalan has continuously kept himself abreast with the body of knowledge in vector biology. He has received extensive  training on arboviruses from 406th SEATO research Centre, Bangkok, at the National Institutes of Health, Tokyo, at the Trinidad Regional Virus Laboratory, Port-of-Spain and at the East African Virus Laboratory in Entebbe in Uganda.[24] He sharpened his knowledge of Malaria vector control at the Malaria Research Institute, Amani in Tanzania and on mosquito taxonomy from P. F. Mattingly at the British Museum (Natural History), London.[25] He had the privilege of learning  Ecology under Charles Elton at Bureau of Animal Populations, Oxford, and Acarology under Dr Hoogstraal, US Naval Medical Research Unit in Cairo during his career.[26] He was associated with Dr Jorge Boshell and many others of the Rockefeller Foundation for two decades.[27] In recognition of his body of scientific work, he was honoured with a Padma Shri by President R Venkataraman in 1990.[28]

List of Publications

  1. Rajagopalan, P.K. Larva and pupa of Aedes (Stegomyia) Walbus Theobald 1905 (Diptera: Culicidae). Indian J. Med. Res. 44: 481-489, 1956.
  2. Ramachandra Rao, T. and Rajagopalan, P.K. Observations on the mosquitoes of Poona District, India with special reference to their distribution, seasonal prevalence and biology of the adults. Indian J. Malariol. 11: 1-54, 1957.
  3. Varma, M.G.R., Trapido, H. and Rajagopalan, P.K. Studies on ticks as possible vectors of Kyasanur Forest Disease. Proc. 9th Pacific Science Congress. 17: 18-90,1957.
  4. Trapido, H., Rajagopalan, P.K., Work, T.H. and Varma, M.G.R. Kyasanur Forest Disease VIII. Isolation of Kyasanur Forest Disease virus from naturally infected ticks of the genus Haemaphysaiis. Indian J, Med, Res. 47:133-138,1959.
  5. Iyer, C.G.S., Work, T.H., Narasima Murthy, D.P., Trapido, H., and Rajagopalan, P.K. Kyasanur Forest Disease VII. Pathological findings in monkeys Preshytis entellus and Macaca radiala, found dead in the forest.   Indian J. Med. Res. 48: 276-286, 1960.
  6. Shah, K.V., Johnson, H.N., Ramachandra Rao, T., Rajagopalan, P.K. and Lamba, B.S. Isolation of five strains ol Sindbis virus in India. Indian J. Med. Res. 48: 300-308, 1960.
  7. Rajagopalan, P.K. Haemaphysaiis megalaimae sp. n., a new tick from the small green Barbet (Megalaima viridis) in India.   J. Parasitol. 49: 304-345, 1963.
  8. Rajagopalan, P.K. Rearing of Ixodes petauristate Warburton, 1933 in laboratory. Indian J. Malariol. 17: 265-268, 1963.
  9. Trapido, H., Hoogstraal, H. and Rajagopalan, P.K. Haemaphysaiis kysanurensis sp. n., a member of the formosensis group in Southern India and Ceylon. J. Parasitol. 50: 295-302, 1964.
  10. Trapido, H., Goverdhan, M.K., Rajagopalan, P.K. and Rebellow, M.J. Ticks ectoparasitic on monkeys in the Kyasanur Forest Disease area of Shimoga District, Mysore State, India. Amer. J. Trop. Med. & Hyg. 13. 763-772, 1964.
  11. Trapido, E., Varma, M.G.R., Rajagopalan, P.K., Singh, K.R.P. and Rebellow, M.J. A guide to the identification of all stages of Haemaphysaiis ticks of South India. Bull. Ent. Res. 55: 249-270,1964.
  12. Rajagopalan, P.K. Description of Nymph and Larva of Ixodes petauristae Warburton. 1933. iL Bombay Nat. His. Soc. 62: 174-176, 1965.
  13. Rajagopalan, P.K. Role of rodents in Kyasanur Forest Disease. Proc. First Inter. Symp. on Rodents. Calcutta, 35-36, 1965.
  14. Rajagopalan, P.K. and Boshell, J. Host and life cycle of Ixodes ceylonesis Kohls, 1950 with description of its male, nymph and larva. J. Parasitol. 52: 1203-1209, 1966.
  15. Bhatt, P.N., Kulkarni, K.G., Boshell, J., Rajagopalan, P.K. Patil, A.P, Goverdhan, M.K. and Pavri, K.M. Kaisodi virus, a new agent isolated from Haemaphysaiis spinigera in Mysore State, Sough India. I. Isolation of strains.   Amer. J. Trop. Med. & Hyg. 15: 958-960. 1966.
  16. Rajagopalan, P.K. Vectors and extra-primate aspects of Kyasanur Forest Disease Symposium on Arborivuses. Ind. Sci. Congr. Chandigarh, 1966.
  17. Paul, S.D., Pavri, K.M., D.Lima, L.V., Rajagopalan, P.K. and Singh, K.R.P. Isolation of En-cephalomyocarditis (EMC) virus strains at the Virus Research Centre, Poona. Indian J. Med. Res. 56: 264-274.
  18. Rajagopalan, P.K., Patil, A.P. and Jorge Boshell, M. Studies on Ixodid tick populations on the Forest floor in the Kyasanur Forest Disease area (1961 -1964). Indian J. Med. Res. 56 (Suppl.): 497-509, 1968.
  19. Rajagopalan, P.K., Patil, A.P. and Jorge Boshell, M. Ixodid ticks and their mammalion hosts in Kyasanur Forest Disease area of Mysore State, India, 1961-1964. Indian J. Med. Res. 56 (Suppl.): 510-526, 1968.
  20. Boshell, J. and Rajagopalan, P.K. Small rodents and shrews in the Sagar - Sorab area, Mysore State, India. Population studies 1961-1964. Indian J. Med. Res. 56 (Suppl.): 527-540, 1968.
  21. Boshell, J., Rajagopalan, P.K., Patil, A.P. and Pavri, K.M. Isolation of Kyasanur Forest Disease virus from Ixodid ticks.  1961-1964. Indian J. Med. Res. 56 (Suppl.): 541-568, 1968.
  22. Boshell, J., Rajagopalan, P.K., Govordhan, M.K. and Pavri, K.M. Isolation of Kyasanur Forest Disease virus from small mammals of the Sagar-Sorab forests. Indian J. Med. Res. 56 (Suppl.): 569-572, 1968.
  23. Boshell, J. and Rajagopalan, P.K. Observations on the experimental exposure of monkeys, rodents and shrews to infestation of ticks in the forest. Indian J. Med. Res. 56 (Suppl.): 573-588, 1968.
  24. Boshell, J. and Rajagopalan, P.K. Preliminary studies on experimental transmission of Kyasanur Forest Disease Virus by nymphs of Ixodes petauristae Warburton, 1933 infected as larvae of Sun-cus murinus and Rattus blanfordi.   Indian J. Med. Res. 56 (4) (Suppl.): 589-593, 1968.
  25. Boshell, J., Goverdhan, M.K. and Rajagopalan, P.K. Preliminary studies on the susceptibility of wood rodents and shrews to KFD virus.  Indian J. Med. Res. 56 (Suppl.): 614-627, 1968.
  26. Pavri, K.M., Rajagopalan, P.K. and Arnestein Paul. Isolation of Ornithosis Dedsoniae from paddy birds Ardeola grayii (Sykes). in Mysore State. India. Indian J. Med. Res. 56 (11): 1529-1594.1968.
  27. Rajagopalan, P.K. A case of albinism in Rattus blanfordi (Thomas). 1881. (Rodentia: Murinal). iL Bom. Bat. Hist. Soc. 64: 554-555, 1968.
  28. Rajagopalan, P.K. Notes on the Malabar spiny Dormouse, Platacanthomys lasiurus Blyth, 1859, with new distribution record. J. Bom. Nat. Hist. Soc. 65: 214-215, 1968.
  29. Rajagopalan, P.K. Kyasanur Forest Disease in India. Paper read at the VIII International Congress of Tropical Medicine and Malaria, Tehran, 1968.
  30. Ramachandra Rao, T. and Rajagopalan, P.K. Epidemiology of Kyasanur Forest Disease. Paper read at Proc. VIII International Congress of Tropical Medicine and Malaria, Tehran, 1968.
  31. Pavri, K.M., Sheikh, B.H., Singh, K.R.P., Rajagopalan, P.K. and Casals, J. Balagodu virus, a new arbovirus isolated from Ardeola gravii (Sykes) in Mysore State, South India. Indian J. Med. Res. 57:758-764, 1969.
  32. Rajagopalan, P.K., Paul, S.D. and Sreenivasan, M.A. Isolation of Kyasanur Forest Disease virus from the insectivorous bas, Rhinolophus rouxi and from Ornithodoros ticks. Indian J. Med. Res. 57: 805-808, 1969.
  33. Rajagopalan, P.K., Paul, S.D. and Sreenivasan, M.A. Involvement of Rattus blanfordi (Rodentia: Murdiae) in the natural cycle of Kysanur Forest Disease virus. Indian J. Med. Res. 57: 999-1002, 1969.
  34. Rajagopalan, P.K. and Work, Telford H. An analysis of mosquito collection with special reference to the incidence andprevalence of Culex vishnui complex in the Japanese Encephalitis infected localities of North Arcot Dislricl, Madras State, India from December 1955 through Docornbor 1967.   Indian J. Med. Res. 57: 1409-1419, 1969.
  35. Dandawate, C.N., Rajagopalan, P.K., Pavri.K.M. and Work, Telford H. Virus isolations from mosquitoes collected in North Arcot District, Madras State and Chittoor District, Andhra Pradesh, between November 1955 and October 1957. Indian J. Med. Res. 57: 1420-1426, 1969.
  36. Drumond, R.O., Rajagopalan, P.K., Sreenivasan, M.A. and Menon, P.KB. Tests with Ixodicides for the control of the tick vectors of Kyasanur Forest Disease.   J. Med. Ent. 6: 245-251, 1969.
  37. Anderson, C.R. and Rajagopalan, P.K. Early investigation of an outbreak of Kyasanur Forest Disease. Indian J. Med. Res. (In Press).
  38. Paul, S.D., Rajagopalan, P.K. and Sreenivasan, M.S. Isolation of West Nile virus from the frugivorous bat. Rousettus leschenaulti. Indian J. Med. Res. 58: 1169-1171, 1970.
  39. Rajagoplan, P.K. and Anderson, C.R. Trans-Monsoonal survival of Kyasanur Forest Disease from infected Haemaphysalis.   Indian J. Med. Res. 58: 1184-1187, 1970.
  40. Rajagopalan, P.K. Notes on Arboreal nests of some rodents. Indian J. Med. Res. 58: 1192-1194, 1970.
  41. Rajagopalan, P.K., Sreenivasan, M.A. and Paul, S.D. Isolation of Ganjam virus from the bird tick Haemaphysalis.   Indian J. Med. Res. 58: 1196, 1970.
  42. Rajagopalan, P.K. and Anderson, C.R. Further studies on the ticks of wild monkeys of the Kyasanur Forest Disease area, Shimoga District, Mysore State, India. Indian J. Med. Res. 59: 847-860,1971.
  43. Ramachandra Rao, T. and Rajagopalan, P.K. Arthropod fauna of the nests of some common birds of Poona, India with special reference to blood sucking forms. J. Bom, Nat. Soc. 67: 414-429, 1971.
  44. Rajagopalan, P.K. Breeding behaviour and development of Rattus rattus wroughtoni Hinton, 1919 (Rodentia: Muridae) in laboratory.   J. Bom. Nat. His. Soc. 67: 552-558, 1971.
  45. Dhanda, Vijai and Rajagopalan, P.K. Ornithodoros (Reticulinasus) chiropteriphila sp. nov. a bat ectoparasite from Mysore State, India. Oriental Insects. 5 (2): 135-144, 1971.
  46. Rajagopalan, P.K. Ixodid ticks (Acarina: Ixodidae) parasitising wild birds of Shimoga District, Mysore State, India. J. Bom. Nat. His. Soc. 69: 55-78, 1972.
  47. Rajagopalan, P.K. Dispersal, mortality and estimation of field field population of Culex fatiqans. Technical Report Series of Indian Council of Medical Research. 20: 152-155, 1972.
  48. Rajagopalan, P.K. Tick borne diseases. Paper read at the Symposium on Arthropod borne disease at the Indian Science Congress at Calcutta, India, 1972.
  49. Yasuno, M., Rajagopalan, P.K., Russell, S. and La Brecque, G.C. Dispersal of Culex faligans in Delhi villages.   WHOA/BC/72-352, 1972.
  50. Yasuno, M.. Rajagopalan, P.K. and La Brecque, G.C. Migration of Culex fatigans from surrounding fields to villages in the Delhi area.   WHOA/BC/72-364. 1972.
  51. Rajagopalan, P.K., Yasuno, M. and Russel, S. Preliminary studies on the development of immature stages of Culex fatiqans in nature. WHOA/BC/72-366. 1972.
  52. Sreenivasan, M.A. and Rajagopalan, P.K. Isolation of Kaisodi virus from the Kyasanur Forest Disease area of Shimoga District, Mysore (1965-1970). Indian J. Med. Res. 61 (1): 15-22, 1973.
  53. Ghosh, S.N. and Rajagopalan, P.K. Encephalomyocarditis virus activity in Mus booduqa (Gray) in Barur village (1961-1962), Sagar, Kyasanur Forest Disease area, Mysore State, India. Indian J. Med. Res. 61 (7): 989-991, 1973.
  54. Rajagopalan.P.K., Yasuno.M. and La Brecque.G.C. Dispersal and survival in the field of chemosterilized, irradiated and cytoplasmic incompatible males of Culex fatiqans. Bull. Wld. Hlth. Org, 48 : 631 -635, 1973.
  55. Yasuno.M., Rajagopalan.P.K., Russel, S. and La Brecque, G.C. Influence of seasonal change in climate on dispersal of released Culex pipiens fatiqans.   Bull. Wld. Hlth. Org. 48 : 317-321, 1973.
  56. Yasuno.M., Kazmi.S.J., La Brecque.G.C. and Rajagopalan.P.K. Seasonal change in larval habitats of population density of Culex fatiqans in Delhi villages.   WHOA/BC 73, 429.
  57. Rajagopalan.P.K, Yasuno.M. and Menon.P.L. Density effect of survival of immature stages of Culex pipiens fatigans in breeding site in Delhi villages. WHOA/BC 79, 430Yasuno.M. and Rajagopalan.P.K. Population estimation of Culex fatigans in Delhi villages. WHOA/BC 79. 431.
  58. Yasuno.M. and Rajagopalan.P.K. An application of the removal method to the population estimation of Culex fatigans resting indoors.   WHOA/BC 73, 458.
  59. Goverdhan.M.K., Rajagopalan.P.K., Narasimha Murthy.D.P., Upadhyaya.S.L., Boshell.J., Trapido.H. and Rao.T.R. Epizootology of Kyasanur Forest Disease in wild monkeys of Shimoga district in Mysore State (1957–64).   Indian J. Med. Res. 62 (4) : 497-510, 1974.
  60. Menon.P.K.B. and Rajagopalan.P.K. A note on Culex tritaeniorhynchus Giles, 1901 in villages near Delhi, India.   WHOA/BC 74, 497.
  61. Ghosh.S.N., Rajagopaian.P.K., Singh.G.K. and Bhat.H.R. Serological evidence of Arbovirus activity in birds of Kyasanur Forest Disease epizootic - Epidemic area, Shimoga district, Karnataka, India.   Indian J. MEd. Res. 63 (9) : 1327-1334, 1975.
  62. Rajagopaian.P.K., Yasuno.M. and Russell, S. Studies on the development and survival of immature stages of Culex fatigans in nature.   J. Com. Pis. 7 : 20-24, 2975.
  63. Rajagopaian.P.K., Menon.P.K.B., Mani.T.R. and Brooks.G.D. Measurement of density of imrna-tures of Culex pipiens fatigans in drains.   J. Com. Pis. 7 (4) : 327-337, 1975.
  64. Yasuno.M., W.W.Macdonald., Curtis.C.F., Grover.K.K., Rajagopaian.P.K., Sharma.LS., Singh.D., Singh.K.R.P., Agarwal.K.V., Kazmi.S.J., Menon.P.K.B., Menon.R., Razdan.R.K. Samuel, D. and Vaidyanathan, V. A control experiment with chemosterilized male Culex pipiens fatigans Wied, in a village near Delhi surrounded by a breeding free zone.   WHOA/BC 75, 522, 1975.
  65. Rajagopaian.P.K. et.al. Measurement of density of immature of Culex fatigans in affluent drains. WHO/VBC 75, 532.
  66. Rajagopaian.P.K. et.al. Estimation of natural survival rates of immalures of Culex pipiens fatigans in open effluent drains (n Faridabad, Northern India.   WHO/VBC 75, 533.
  67. Rajagopaian.P.K. et.al. A study on some aspects of Culex pipiens fatigans populations in an urban area, FAridabad, Northern India.   WHO/VBC 75, 539.
  68. Rajagopaian.P.K. The density dependence of larval mortality of Culex pipiens fatigjans in an urban situation and prediction of its effects on genetic control operations.   WHOA/BC 75, 540.
  69. Rajagopaian.P.K. Observation on the biting activity and flight periodicity of Culex pjpjonafaUgans in an urban area.   WHOA/BC 75, 544.
  70. Menon.P.K.B. and Rajagopaian.P.K. Some observations on resting and swarming behaviour of Culex pipiens fatigans in an urban situation.   WHO/VBC 75, 555.
  71. Yasuno.M., Rajagopaian.P.K. and La Brecque.G.C. Migration patterns of QulSK atigans around Delhi, India.   Tropical Medicine. 17 (2) : 91-96, 1975.
  72. Rajagopaian.P.K., Yasuno.M., and Menon.P.K.B. Density effect on survival of immature stages of Culex fatigans in breeding sites in Delhi villages.   Indian J. Med. Res. 64 : 699-708, 1976.
  73. Menon.P.K.B. and Rajagopaian.P.K. A note in Culex tritaeniorhynchus Giles, 1901, in villages near Delhi.   Indian J. Med. Res. 64 (5) : 709-712, 1976.
  74. Rajagopaian.P.K., Brooks.G.D. and Menon.P.K.B. Estimation of natural survival of immalures of Culex pipiens fatigans in open effluent drains in Faridabad, Northern India. J. Com. Pis. 8(1) 11-17, 1976.
  75. Brooks.G.D., Curtis.C.F., Grover.K.K., Krishnamurthy.B.S., Laven.R., Rajagopaian.P.K., Sharma.LS., Sharma.V.P., Singh, D., Singh.K.R.P., Yasuno.M., Agarwal.H.V., Batra.C.P., Chandrahas.R.K., Menon.P.K.B., Menon.R., Das.S., Razdan.R.K., Samuel, D. and Vaidyananathan, V. A field trial on genetic control of Culex pipiens fatigans Wied, by release of males of integrated strain IS-31B.   WHOA/BC 756, 635.
  76. Yasuno.M., Rajagopalan.P.K. and Russel.S. An application of the removal method to the population estimation of Culex. fatiggns resting indoors.   Indian J. Med. Res. 65 (Suppl) : 34-42, 1977.
  77. Menon.P.K.B. and Rajagopalan.P.K. Some observations on resting and swarming of Culex pipiens fatigans in an urban situation.   Indian J. Med. Res. 65 (Suppl) : 43-51, 1977.
  78. Yasuno.M..Rajagopalan.P.K., Kazmi.S. J. and La Brecque.G.C. Seasonal change in larval habitats and population density of Culex fatigans in Delhi villages. Indian J. Med. REs. 65 (Suppl): 52-64, 1977.
  79. Rajagopalan.P.K., Menon.P.K.B. and Brooks.G.D. A study on some aspects of Culex pipiens fatigans population in an urban area, FAridabad, Northern India. Indian J. Med. Res. 65 (Suppl) 65-76, 1977.
  80. Rajagopalan.P.K., Brooks.G.D. and Menon.P.K.B. The density dependence of larval mortality of Culex pipiens fatigans in an urban situation and prediction of its effects on genetic control operations.   Indian J. Med. Res. 65 (Suppl) 77-85, 1977.
  81. Rajagopalan.P.K., Kazmi.S.J. and Mani.T.R. Some aspects of transmission of Wuchereria bancrofti and ecology of the vector Culex. pipiens fatigans in Pondicherry. Indian J. Med. Res. 66:200-215,1977.
  82. Menon.P.K.B. and Rajagopalan.P.K. Mosquito control potential of some aspects of indigenous fishes in Pondicherry.   Indian J. Med. Res. 66 : 765-771, 1977.
  83. Panicker.K.N., and Rajagopalan.P.K. Biological control of potential of Anisopa bouvieri kirkaldy (Hemiptera : Notonectidae).   Indian J. Med. Res. 66 : 772-776, 1977.
  84. Rajagopalan.P.K., Menon.P.K.B., Brooks.G.D. and Mani.T.R. Observations on the biting activity and flight periodicity of Culex pipiens fatigans in an urban area, Faridabad. J. Com. Pis. 9 (1) : 22-23, 1977.
  85. Yasuno.M. and Rajagopalan.P.K. Population estimation of Culex fatigans in Delhi. J. Com. Pis. 9(3) : 172-183, 1977.
  86. Rajagopalan.P.K. and Panicker.K.N.   A note on the 1976 epidemic of Japanese encephalitis in Burdwan district, West Bengal.   Indian J. Med. Res. 68 : 393-398, 1978.
  87. Panicker.K.N. and Rajagopalan.P.K. A note on the tree hole breeding mosquitoes in Pondicherry.   Indian J. Med. Res. 68 : 610-613. 1978.
  88. Menon.P.K.B. and Rajagopalan.P.K. Control of mosquitoes breeding in wells by using Gambusia affinis and Aplocheilus blochii in Pondicherry town.   Indian J. Med. Res. 68 : 927-933, 1978.
  89. Rajagopalan.P.K., Sreenivasan.M.A. and Anderson, C.R. Ixodid ticks of red spurfowls (Galloper-dlx spadicea spadicea) in the Kyasanur Forest Disease area, Karnataka State. IndianJ. Med. Res 68 : 949-953, 1978.
  90. Rajagopalan.P.K., Menon.P.K.B. and Panicker.K.N. An ecological appraisal of the mosquitogenic conditions in Tirunelveli district, Tamil Nadu.   J. Com. Pis. 10 (3) : 157-164, 1978.
  91. Das.P.K. and Rajagopaian.P.K. Malaria in India-Some lessons to learn. Proceedings of Eighth National Conference on Communicable Diseases of All India Institute of Hygiene and Public Health, Calcutta, 8-10 Dec, 1978, p. 131-135.
  92. Yasuno.M., Macdonald.W.W., Curtis.C.F., Grover.K.K., Rajagopaian.P.K. et.al. A control of experiment with chemosterilized male Culex pipiens fatigans Wied in a village near Delhi surrounded by a breeding free zone.   J. Saint. Zool. 29, 4, 325-343, 1978.
  93. Rajagopaian.P.K. Biological control methods. Paper presented at the WHO sponsored Workshop on "Methodology of applied research in malaria" held in Bangalore, 17–29 July 1978.
  94. Chandrahas.R.K. and Rajagopaian.P.K. Mosquito breeding and the natural parasitism of larvae by a fungus, Coelomomyces and a mermithid nematode, Romanomermis. in paddy fields in Pon-dicherry.   Indian J. Med. Res. 69 : 63-70, 1979.
  95. Bheema Rao.U.S., Gajanana.A. and Rajagopaian.P.K. A note on the tolerance of the mermithid nematode, Romanomermis sp., to different pH and salinity. Indian J. Med. Res 69 : 423-427, 1979.Rajagopaian.P.K., Chandrahas.R.K. and Panicker.K.N. Mosquito collections in Pattukottai and adjacent localities in Thanjavur district, Tamil Nadu, with particular reference to Anopheles culicifacies Giles.   Indian J. Med. Res. 69 : 589-597, 1979.
  96. Rajagopaian.P.K. Problems of vector control in insects and host specificity, Mac Millan & Co., Madras, pp. 123–127, 1977.
  97. Sreenivasan.M.A., Bhat.H.R. and Rajagopaian.P.K. Studies on the transmission of Kyasanur Forest Disease virus by partly fed Ixodid ticks.   Indian J. Med. 69 : 708-713, 1979.
  98. Das.P.k. and Rajagopaian.P.K. Susceptibility of larvae of Culex faitgans (Wiedmann), Anopheles stephensi (Liston) and Aedfis aegypii (Linnaeus) to Malathion, Fenthion, Temephos, Dichlorovos and Carbaryl In Pondicherry.   Indian J. Med. Res. 70 : 412-416, 1979.
  99. Gajanana.A., Tewari.S.C, Reuben, R. and Rajagopaian.P.K. Partial suppression of malaria parasites In Aedes aegypti and Anopheles stephensi doubly infected with Nosema algerae and Plasm-Odium-   Indian J. Med. Res. 70 : 417-423, 1979.
  100. Das.P.K. and Rajagopaian.P.K. Laboratory studies on the biology of Anopheles culicifacies (Giles).   Indian J, MEd, Res. 70 : 424-428,1979.
  101. Chandrahas.R.K., Arunachalam.N., Panicker.K.N. and Rajagopaian.P.K. Density measurements of Anopheles culicifacies (Giles) during malaria transmission in Pattukottai, Thanjavur district, Tamil Nadu.   Indian J. Med. Res. 70 : 429-434, 1979.
  102. Balaraman.K., Bheema Rao., U.S. and Rajagopaian.P.K. Bacterial pathogens of mosquito larvae - Bacillus alvei (Cheshire and Cheyene) and Bacillus brevis (Migula) isolated in Pondicherry. Indian J. Med. Res. 70 : 615-619, 1979.
  103. Geetha Bai.M., Das.P.K., Gajanana.A. and Rajagopaian.P.K. Host parasite relationship of NOsema algerae, a parasite of mosquitoes.   Indian J. Med. Res. 70 : 620-624, 1979
  104. Balaraman.K., Bheema Rao.U.S. and Rajagopalan.P.K. Isolation of Metarrhizium anisopliae, Beauveria tennella and Fusarium oxyporum (Deuteromycetes) and their pathogenecity to Culex fatigans and Anopheles Stephens!.   Indian J. Med. Res. 70 : 718-722, 1979.
  105. P.S.SHETTY AND P.K.RAJAGOPALAN. A preliminary note on phlebotomine sandflies of Pon-dicherry.   IJMR 70,1979,954-956.
  106. P.K.B.MENON AND P.K.RAJAGOPALAN. Seasonal changes in the density and natural mortality of immatures stages of the urban malaria vector, Anopheles stephensi (Liston)in Pondicherry. IJMR 70 (Suppl.),1979,123-127.
  107. P.K.B.MENON AND P.K.RAJAGOPALAN. Relative importance of different types of breeding habitats in contributing to the population of Culex quinquefasciatus in Pondicherry. IJMR 71,1980,725-733.
  108. P.K.RAJAGOPALAN, A.GAJANANA, P.S.SHETTY AND N.ARUNACHALAM. Attempts to establish WucJiereiia bauciQili in slow loris, Loris tardigradus.   IJMR 72,1980,203-205.
  109. P.K.DAS AND P.K.RAJAGOPALAN. Insecticides susceptability status of colonized strain of Anopheles culicifacles Giles.   IJMR 72,1980,218-221.
  110. P.K.DAS AND P.K.RAJAGOPALAN. Insecticide resistance in Culex quinquefasciatus and its relevance to vector control.   IJMR 72,1980,500-507.
  111. A.GAJANANA, P.K.RAJAGOPALAN AND R.REUBEN. A note on the refractoriness of slender loris (Loris tardigradus) Plasmodlum vivax.   IJMR 72,1980,497-499.
  112. P.K. RAJAGOPALAN.   Population dynamics of Culex pipiens fatigans, the filariasis vector in Pon-dicherry - influence of climate and environment.  INSECT VECTOR BIOLOGY -(PRO.IND.NATLSCI.ACA.), B.46,1981,745-751.
  113. P.K.RAJAGOPALAN, P.S.SHETTY AND N.ARUNACHALAM. A filariasis survey in Pondicherry villages.  IJMR 73 (Suppl.),1981,73-77.
  114. P.K.B.MENON AND P.K.RAJAGOPALAN. Seasonal changes in survival rates of immatures of Culex pipiens fatigans in different habitats in Pondicherry.   IJMR 73 (Suppl.), 1981,136-138.
  115. P.K.DAS AND P.K.RAJAGOPALAN. Role of simulated migration of mosquitoes in development and reversal of malathion resistance in Culex pipiens fatigans.    IJMR 73 (Suppl.),1981,139-143.
  116. K.BALARAMAN, P.K.DAS AND P.K.RAJAGOPALAN. Biochemical studies of some mosquitoes in relation to development of Wuchereria bancrofti.   IJMR 73 (Suppl.), 1981,144-146.
  117. M.GEETHA BAI, K.N.PANICKER AND P.K.RAJAGOPALAN. Laboratory studies on the biology of Armigeres subalbatus Coquilett.1898.   IJMR 73 (Suppl.),1981,151-154.
  118. K.BALARAMAN, P.JAMBULINGAM AND P.K.RAJAGOPALAN. Larval susceptibility of QiAsx pipiens fatigans and Anopheles stephensi to Metarrhizium anisopliae. IJMR 73 (Suppl.),1981,160-162.
  119. P.K.RAJAGOPALAN. Prospectus for biological control of mosquitoes. IJMR 73 (Suppl.),1981,163-173.
  120. P.K.RAJAGOPALAN, M.GEETHA BAI AND N.ARUNACHALAM. Age deterimination of man-biting population of Culex pipiens fatigans with particular reference to transmission of Wuchereria bancrofti in Pondicherry.   IJMR 73 (Suppl.),1981,739-745.
  121. RAJAGOPALAN, P.K., and SREENIVASAN, M.A. Ixodid ticks on cattle and buffaloes in the Kyasanur Forest Disease area of Karnataka State. IJMR 73, 1981, 880-889.
  122. P.K.RAJAGOPALAN. Recent advances in research in biological control of vectors. RECENT ADVANCES IN ENTOMOLOGY, 1981,133-138.
  123. M.GEETHA BAI, K.N.PANICKER AND P.K.RAJAGOPALAN. Biology of predator mosquito JmQLi hynchites splendens (Wiedemann) (Diptera : Culicidae).IJMR 74,1981,13-17.
  124. P.K.DAS, T.MARIAPPAN AND P.K.RAJAGOPALAN.Evaluation of methoprene (a juvenile hormone) against Culex quinquefasciatus. Anopheles stephensi and Aedes aegypti. IJMR 74,1981,18-22.
  125. P.K.RAJAGOPALAN. Vector control operations in rural areas and community participation. APPRO.TECH.PRIMARY HEALTH CARE, 1981,87-95.
  126. M.H.BIRLEY AND P.K.RAJAGOPALAN. Estimation of survival and biting rates of Culex quinquefasciatus (Diptera : Culicidae). J. MED. ENT,18,1981,181-186.
  127. RAJAGOPALAN, P.K., DAS, P.K., VAITHILINGAM, C, BABU, C.J., ARUNACHALAM, N., MARIAP-PAN, T., RAJAVEL, A.R., NARASIMHAN, P.V.S.L, RAMAIAH, K.D., PRADEEP KUMAR.N., PAILY, K.P., AMALRAJ, D„ SURYANARAYANAMURTHY.U. and BALAKRISHNAN, N. Filariasis Control Demonstration Project - A summary Report.   VBC/ECV/EC/82.14, 1982.
  128. RAJAGOPALAN, P.K. Promising Biological Control Agents for mosquito control and procedure for field evaluation of B_. thuringiensis serotype H.I4. Paper presented at the Workshop on Regional Manpower Requirements in Entomological aspects of Malaria Control Programmes, Colombo, Sri Lanka. SEA/MAL Meet. 11/WP.24, 1981.
  129. RAJAGOPALAN, P.K. Integrated Vector Control Programme in developing countries and the place of biological control agents. Proceedings of the Invertebrate Pathology and Microbial Control. Illrd International Colloquium on Invertebrate Pathology. XVth Annual Meeting of the Society for Invertebrate Pathology, 6-10 Sept., 1982, University of Sussex, Brighton, U.K.
  130. RAJAGOPALAN, P.K. Man power and training needs in Integrated Vector Control. Paper presented at the WHO Inter Regional Workshop on Integrated Control of Vectors, Pondicherry during October, 1983.   SEA/VBC/Meet. 1A/VP.7.7,  1983.
  131. RAJAGOPALAN, P.K. Research needs on Vector Biology. Paper presented at the Indo-UK Workdhop on Malaria held at Delhi, 1983.
  132. CURTIS, C.F., BROOKS, G.D., ANSARI, A., GROVER, K.K., KRISHNAMURTHY, B.S., RAJAGOPALAN, P.K. et al. A field trial on control of Culex quinquefasciatus by release of males of a strain integrating cytoplasmic incompatibility and a translocation. Ent. Exp. & Appl. 31: 181-190,1982, Ned. Entomol. Ver. Amsterdam.
  133. SREENIVASAN, M.A., RAJAGOPALAN, P.K. and BHAT, H.R. Spatral distribution of infected Haemaphysalis nymphs in the epizootic localities of Kyasanur Forest Disease. Ind. J. Med. Res. 78: 531-536, 1983.
  134. CHANDRAHAS, R.K., JAMBULINGAM P., SABESAN, S. and RAJAGOPALAN, P.K. Epidemiologi-cal aspects of malaria in Rameswaram Island (Tamil Nadu). Indian J. Med. Res. 80: 34-42, 1984.
  135. SABESAN, S., JAMBULINGAM, P., KRISHNAMOORTHY, K., VIJAYAN, V.A., GUNASEKARAN, K., RAJENDRAN, G„ CHANDRAHAS, R.K. and RAJAGOPALAN, P.K. Natural infection and vectorial capacity of Anopheles culicifacies Giles in Rameswaram Island. IJMR 80: 43-46, 1984.
  136. JAMBULINGAM, P., SABESAN, S„ VIJAYAN, V.A., KRISHNAMOORTHY, K.. GUNASEKARAN, K., RAJENDRAN, G„ CHANDRAHAS, R.K. and RAJAGOPALAN, P.K. Density and biting behaviour of Anopheles culicifacies Giles in Rameswaram Island (Tamil Nadu). Indian J. Med. Res. 80: 47-50, 1984.
  137. K.N.PANICKER, U.S.BHEEMA RAO AND P.K.RAJAGOPALAN. Investigations of persistent malaria transmission in Pudukuppam, a coastal village of Pondicherry.   IJMR 80,1984,51-56.
  138. K.N.PANICKER AND P.K.RAJAGOPALAN. Laboratory studies on the biology of Anopheles sub-pjclUSGrassi 1899.   IJMR 80,1984,57-59.
  139. K.N.PANICKER AND P.K.RAJAGOPALAN. Field observations on the swarming and mating behaviour of AiiojjheJe^sjibj^lciijaGrassi 1899.   IJMR 80,1984,60-62.
  140. P.K.RAJAGOPALAN AND K.N.PANICKER. Feasibility of community participation for vector control in villages.   IJMR 80,1984,117-124.
  141. P.K.RAJAGOPALAN, P.JAMBULINGAM, S.SABESAN, K.KRISHNAMOORTHY, S.RAJENDRAN, K.GUNASEKARAN AND N.PRADEEP KUMAR. Population movement and malaria peristence in Rameswaram Island. ICMR BULL.14.11.1984,125-133.
  142. RAJAGOPALAN, P.K. and PANICKER, K.N. Feasibility of community involvement in integrated vector control in villages.   WHOA/BC/84.903. 1984.
  143. RAJAGOPALAN, P.K. and DAS, P.K. Environmental Control of Filariasis in Pondicherry. "Facets of Environmental Problems" Edited by C.R. Krishnamurthi, National Committee of SCOPE, Indian National Science Academy, New Delhi, 1984.
  144. RAJAGOPALAN, P.K. and PANICKER, K.N. Financial rewards ensure community involvement. World Health Forum Vol. 6, No.2, 174-176, 1985.
  145. K.N.PANICKER, R.SRINIVASAN, K.VISWAM AND P.K.RAJAGOPALAN. Larvivorous potential of some sypriniformes fishes.   IJMR 82,1985,517-520.
  146. P.K.RAJAGOPALAN AND K.N.PANICKER. Financial rewards ensure community involvement. WORLD HEALTH FORUM 6,1985,174-176.
  147. RAJAGOPALAN, P.K. Role of local Government in community participation for DHC vector control. Paper presented at the Inter Regional Scientific Working Group Meeting on Community Participation in prevention and control of DF/DHF 13-17 Dec, 1983 at Bangkok.
  148. P.K.RAJAGOPALAN AND P.K.DAS. Integrated vector management for urban filariasis control in Pondicherry. ICMR BULLETIN 15,11,1986,133-140.\
  149. K.N.PANICKER AND P.K.RAJAGOPALAN. Vector control through integrated rural development. ICMR BULLETIN 16,2,1986,1-5.
  150. K.BALARAMAN AND P.K.RAJAGOPALAN. Bacillus thurlngiensls H-14 and its prospects for mosquito control.   ICMR BULLETIN 16,3,1986,25-30.
  151. P.K.RAJAGOPALAN, P.JAMBULINGAM, S.SABESAN, K.KRISHNAMOORTHY, G.RAJENDRAN, K.GUNASEKARAN AND N.PRADEEP KUMAR. Population movement and malaria persistence in Rameswaram Island.   SOC.SCI. MED.22, 8, 1986, 879-886\S.SABESAN, K.KRISHNAMOORTHY, P.JAMBULINGAM, G.RAJENDRAN,
  152. N.PRADEEPKUMAR AND P.K.RAJAGOPALAN. Breeding habitats of Anopheles culiclfacles in Rameswaram Island. IJMR 84,1986,44-52.
  153. P.JAMBULINGAM, S.SABESAN, K.KRISHNAMOORTHY, G.RAJENDRAN, N.PRADEEPKUMAR AND P.K.RAJAGOPALAN. Malaria control in Rameswaram Island and in South India. ICMR BULLETIN 16,8,1986,89-94.
  154. P.K.RAJAGOPALAN AND K.N.PANICKER. Vector control: How to gain acceptance and support from community.   WHO CHRONICLE 40,5,1986,184-187.
  155. P.K.RAJAGOPALAN, K.N.PANICKER AND P.K.DAS. Control of malaria and filariasis vectors in South India.   PARASITOLOGY TODAY 3,8,1987,233-240.
  156. M.A. SREENIVASAN, H.R. BHAT and P.K. RAJAGOPALAN. The Epizootics of Kyasanur forest disease in wild monkeys during 1964 to 1973.   Trans. Roy. Soc. Trop. Med. Hyg.  1986, 80: 810.
  157. RAJAGOPALAN, P.K., and DAS, P.K. Filariasis Control by Integrated Vector Management. Proceedings of the ICMRA'VHO Workshop to Review Research Results on Community Participation for Disease Vector Control, 3-9 Feb. 1988, 85-99.
  158. RAJAGOPALAN, P.K. URBAN VECTOR CONTROL IN INDIA. Proceedings of the International Conference on Medical and Veterinary Dipterology, Nov. 30 - Dec. 4, 1987, pp. 19–22.
  159. P.K.RAJAGOPALAN AND P.K.DAS. What ails mosquito control programmes in India. BULLETIN OF SCIENCES 4,1,1988,14-17.
  160. P.K.RAJAGOPALAN, P.K.DAS, S.P.PANI, T.MARIAPPAN, A.R.RAJAVEL, K.D.RAMAIAH, D.AMAL-RAJ, K.P.PAILY, N.BAL4KRISHNAN, C.SADANANDANE, P.VANAMAIL, S.SUBRAMANIAN, R.SRINIVASAN, N.ARUNACHALAM, C.M.R.REDDY, C.B.S.REDDY AND N.SOMACHARY. Evaluation of integrated vector control measures on filariasis transmission in Pondicherry. IJMR 87,1988,434-439.
  161. P.K.RAJAGOPALAN. Insects, communicable diseases and health role of government, society and individual. Swasth Hind, 32, 3 & 4, 1988, 78-81.
  162. P.K.RAJAGOPALAN. Malaria and its control in India. HEALTH FOR MILLIONS, Aug., 1988., 1988,6-8.
  163. P.K.RAJAGOPALAN AND P.K. DAS. Primary health care; Theory and practice in the Indian Context.  ICMR Bulletin, 18, 6, 1988, 55-59.
  164. P.K. RAJAGOPALAN and K.D. RAMAIAH. Vectors of Japanese encephalitis in India, their breeding habitats and control. Proc. Sym. on J. Encephalitis, West Bengal, 1986, 17-29.
  165. P.K. RAJAGOPALAN, K.N. PANICKER, S. SABESAN, K. KRISHNAMOORTHY AND A. SUDHAKAR RAO. Control of Brugian filariasis in Shertallai, South India: precontrol epidemiological observations. VCRC Pbn., 7, 1988.
  166. P.JAMBULINGAM, S.S.S. MOHAPATRA, LK. DAS, P.K. DAS AND P.K. RAJAGOPALAN. Detection of Plasmodium ovale in Koraput District, Orissa State. Indian J. Med. Res.. 89, 1989, 117-118.
  167. P.K. RAJAGOPALAN, S.P. PANI, P.K. DAS and P. JAMBULINGAM. Malaria among children in Koraput District, Orissa, Indian J. Paediatrics, 56, 1989, 355-364.
  168. M.A.SREENIVASAN, P.K. RAJAGOPALAN and H.R. BHAT. Isolation of Kyasanur Forest Disease virus from Ixodid ticks collected between 1965 and 1972. Reprinted from: Progress in Acarology, Vol. 1, editred by G.P. Channabasavanna and C.A. Viraktamath, Oxford & IBH Publishing Co. Pvt. Ltd., p. 37-44.
  169. RAJAGOPALAN, P.K., DAS, P.K., SUBRAMANIAN, S., VANAMAIL, P., RAMAIAH, K.D. Control of bancroftian filariasis in Pondicherry, South India: I. Pre-control epidemiological observations. Epidemiolo. Infect. 1989; 103: 685-692.
  170. SUBRAMANIAN, S., PANI, S.P., DAS, P.K. AND RAJAGOPALAN, P.K. Bancroftian filariasis in Pondicherry, South India: II. Epidemiological evaluation of the effect of vector control. Epidemiol. Infect. 1989; 103:693-702.
  171. SUBRAMANIAN, S., VANAMAIL, P., RAMAIAH, K.D., PANI, S.P., DAS, P.K., AND RAJAGOPALAN, P.K. A simple deterministic model for host parasite relationship In Wuchererla bancrofti infection & its relevance to regulation of parasite in human host. IJMR 89, 1989, 411-417.
  172. RAJAGOPALAN, P.K., PANICKER, K.N., & PANI, S.P. Impact of 50 years of vector control on the prevalence of Brugia malayi in Shertallai area of Kerala state. IJMR 89,1989, 418-425.
  173. VANAMAIL, P., SUBRAMANIAN, S., DAS, P.K., PANI, S.P., RAJAGOPALAN, P.K., BUNDY, D.A.P. & GRENFELL, B.T. Estimation of the age-specific rates of acquisition and loss of Wuchereria bancrofti infection. Transactions 83, 5, 1989, 689-693.
  174. RAJAGOPALAN, P.K., DAS, P.K., PANI, S.P., JAMBULINGAM, P., MOHAPATRA, S.S.S., GUNASEKARAN, K AND DAS, L.K. Parasitological aspects of malaria persistence in Koraput District, Orissa, India. IJMR, 1990, 91, 44-51.
  175. P. VANAMAIL, S. SUBRAMANIAN & P.K. RAJAGOPALAN. A mathematical analysis of various factors involved in transmission of Bancroftian filariasis in Pondicherry. Indian J. Med. Res. 1990, 91, 289-292.
  176. P. VANAMAIL, S. S. SUBRAMANIAN, P.K. DAS, S.P. PANI 7 RAJAGOPALAN. Estimation of fecun-dic life span of W_. bancrofti from a longitudinal study of infection in human population in an endemic area of Pondicherry, South India. Indian J. Med. Res. 1990,91, 293-297.
  177. P.K. RAJAGOPALAN, P.K. DAS, K.N. PANICKER, R. REUBEN, D. RAGHUNATHA RAO, LS. SELF, ANDJ.D. LINES. Environmental and Water Management for Mosquito Control. In: APPROPRIATE TECHNOLOGY IN VECTOR CONTROL, Editor: C.F. Curtis, CRC Press, Inc., Boca Raton, Florida.
  178. P.K. RAJAGOPALAN, AND P.K. DAS. Problems of Malaria Control in Tribal Areas. ICMR Bulletin, 20,5, 1990.
  179. Rajagopalan P. K, and P. K Das. Environmental Control of Filariasis in Pondicherry. Facets of Environmental Problems : Five case studies (1984): 21-34 183.  
  180. Sabesan S, P Jambulingam, K Krishnamurthy, V. A Vijayan, K Gunasegaram, G Rajendran, R K Chandrahas, and P. K Rajagopalan. Natural Infection & Vectorial Capacity of Anopheles Culicifacies Giles in Rameswaram Island (Tamil Nadu). Indian Journal of Medical Research 80 no. 7 (1984); 43-46.
  181. Jambulingam P.S. Sabesan, V.A Vijayan, K Krishnamurthy, K Gunasegaram, G Rajendran, R.K., Chandrahas, and P. K Rajagopalan. Density & Biting Behavior of Anopheles Culicifacies Giles in Rameswaram Island (Tamil Nadu). Indian Journal of Medical Research 80, no. 7 (1984): 47-50.
  182. Rajagopalan P. K, and P. K Das. Integrated Vector Management for Urban Filariasis Control in Pondicherry. ICMR Bulletin 15, no. 11 (1985): 133-40 186    Rajagopalan P.K, and K.N Panicker. Vector Control: How to Gain Acceptance and Support from the Community. WHO Chronicle 40, no. 5 (1986):
  183. Rajagopalan P. K, K. N Panicker, and P. K Das. Control of Malaria and Filariasis Vectors in South India. Trends in Parasitology (Parasitology Today) 3, no. 8 (1987): 233-41.
  184. Rajagopalan P. K, and P. K Das. What Ails Mosquito Control Programmes in India. Bulletin of Sciences 4, no. 1 (1988): 14-17.
  185. Rajagopalan P.K: Malaria and Its Control in India. Health for Millions (1988): 6-8.
  186. Rajagopalan P. K, S. P Pani, P. K Das, and P Jambulingam. Malaria in Koraput District of Orissa. Indian Journal of Pediatrics 56, no. 3 (1989): 355-64.
  187. Rajagopalan P. K, and P. K Das. Problems of Malaria Control in Tribal Areas. ICMR Bulletin 20, no. 5 (1990): 41-46.
  188. Rajagopalan P.K. Filariasis in India. National Medical Journal of India 3, no. 1 (1990): 1-4.
  189. Grenfell B. T, P. K Das, P. K Rajagopalan, and D. A. P Bundy. Frequency Distribution of Lymphatic Filariasis Microfilariae in Human Populations: Population Processes and Statistical Estimation. Parasitology 101, no. 3 (1990): 417-27.
  190. Das P. K, A Manoharan, A Srividya, B. T Grenfell, D. A. P Bundy, P Vanamail, and P. K Rajagopalan. Frequency Distribution of Wuchereria Bancrofti Microfilariae in Human Populations and Its Relationships with Age and Sex. Parasitology 101, no. 3 (1990): 429-34.
  191. Vanamail P, S Subramanian, P. K Das, S. P Pani, and P. K Rajagopalan. "Estimation of Fecundic Life Span of Wuchereria Bancroft! from Longitudinal Study of Human Infection in an Endemic Area of Pondicherry (South India)". Indian Journal of Medical Research 91, no. July (1990): 293-97.(230}
  192. Rajagopalan P.K. "Filariasis in India". National Medical Journal of India 3, no. 1 (1990): 1-4.(216).
  193. Grenfell B. T, P. K Das, P. K Rajagopalan, and D. A. P Bundy. "Frequency Distribution of Lymphatic Filariasis Microfilariae in Human Populations: Population Processes and Statistical Estimation". Parasitology 101, no. 3 (1990): 417-27.(238).
  194. Das P. K, A Manoharan, A Srividya, B. T Grenfell, D. A. P Bundy, P Vanamail, and P. K Rajagopalan. "Frequency Distribution of Wuchereria Bancroft! Microfilariae in Human Populations and Its Relationships with Age and Sex". Parasitology 101, no. 3 (1990): 429-34, (239)
  195. Pani S.P, A Srividya,  and P.K Rajagopalan. "Clinical  Manifestations of Bancroftian Filariasis in  Relation to Microfilaraemia and Diethylcarbamazine Therapy". National Medical Journal of India 4 (1991): 9-14. (248).
  196. Rajagopalan P.K, and S.P Pani. "Community Drug Trials for Lymphatic Filariasis Control in India". National Medical Journal of India 4, no. 2 (1991): 71-76. (250)
  197. Srividya A, S. P Pani, P. K Rajagopalan, D. A. P Bundy, and B. T Grenfell. "The Dynamics of Infection and Disease in Bancroftian Filariasis". Transactions of the Royal Society of Tropical Medicine and Hygiene 85, no. 2 (1991): 255-59. (251)
  198. Bundy D. A. P, B. T Grenfell, and P. K Rajagopalan. "Immunoepidemiology of Lymphatic Filariasis: The Relationship between Infection and  Disease". Trends in Parasitology (Parasitology Today) 7, no. 3 (1991): A71-A75.(249)
  199. Pani S.P, A Srividya, and P.K Rajagopalan. "Clearance of Microfilaraemia Following Diethylcarbamazine (Dec) Therapy in Periodic Wuchereria Bancrofti Infection: Relation with Age, Sex, Microfilaria Count and Clinical Status". Tropical Biomedicine 8, no. 1 (1991): 59-65.(273).
  200. Das P. K, A Manoharan, S Subramanian, K. D Ramaiah, S. P Pani, A. R Rajavel, and P.K. Rajagopalan. "Bancroftian Filariasis in Pondicherry, South India - Epidemiological Impact of Recovery of the Vector Population". Epidemiology and Infection 108, no. 3 (1992): 483-93.(297)
  201. Dennis D. T, G Dreyer, M. M Ismail, V Kumaraswami, J. W Mak, J. U Mataika, E. A Ottesen, W. F Piessens, P. K Rajagopalan, B. A Southgate, and H. J Zheng. "Lymphatic Filariasis: Diagnosis and Pathogenesis". Bulletin of the World Health Organization 71, no,2 (1993): 135-41.(244).

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