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Comparison of the survival of Theileria parva-iniected adult Rhipicephalus appendiculatus (Acari: Ixodidae) and their infection under simulated climate conditions in the laboratory and in the field

  • H. OchandaEmail author
Article

Abstract

Five groups of adult Rhipicephalus appendiculatus Neumann, with an average of 98 Theileria parva-infected salivary gland acini per tick, were exposed to four different temperature conditions in the laboratory or to quasi-natural conditions in Kenya. The survival of the infected ticks and T. parva parasites in their salivary glands were determined over time. Ticks kept under quasi-natural conditions survived up to 86 weeks. This period was longer than that of ticks exposed to any of the four laboratory conditions, except the diurnal temperature rhythm of 13–23 °C and 85% relative humidity (RH) to which it was comparable. Theileria parva survived for 82 weeks in ticks exposed to quasi-natural conditions, a period which was much longer than that of the parasites in ticks maintained under any of the laboratory conditions. Survival of the infected ticks and their infections seemed to be adversely affected by higher temperatures in the laboratory or drought in the field. There was an apparent density-dependent influence in parasite survival, with a dramatic fall in infection occurring in the more highly infected ticks before stabilizing at lower levels.

Résumé

Resume: Cinq groupes de Rhipicephalus appendiculatus Neumann adultes avec un taux moyen d’infestation de leurs glandes salivaires de 98% par Theileria parva, ont été exposés à quatre conditions de température différentes au laboratoire et à des conditions presque naturelles. La survie des tiques et de leurs parasites a été suivie dans le temps. Les tiques maintenues en conditions naturelles ont survécu près de 86 semaines. Cette durée de survie est supérieure à celles observées dans les autres conditions de laboratoire, à l’exception des tiques maintenues à un rythme de températures de 13–23°C et une humidité relative de 85%. Theileria parva a survécu près de 82 semaines dans les tiques maintenues en conditions naturelles, une durée de survie supérieure à celles des parasites maintenues en conditions de laboratoire. La survie des tiques et de leurs parasites semble être altérée par les températures élevées du laboratoire et par la sécheresse des conditions naturelles. Il semble que la survie du parasite est fortement influencée par la densité, avec une chute drastique de l’infection sur les tiques fortement infestées, suivie d’une stabilisation aux faibles valeurs.

Key words

Theileria parva Rhipicephalus appendiculatus quasi-natural conditions laboratory environmental conditions survival density dependence 

Mots clés

Theileria parva Rhipicephalus appendiculatus conditions presque naturelles conditions de laboratoire survie densité dépendance 

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References

  1. Bailey K. P. (1960) Notes on the rearing of Rhipicephalus appendiculatus and their infection with Theileria parva for experimental transmission. Bulletin of Epizootic Diseases of Africa 8, 33–43.Google Scholar
  2. Billiouw M., Mataa L., Marcotty T., Chaka G., Brandt J. and Berkvens D. (1999) The current epidemiological status of bovine theileriosis in eastern Zambia. Tropical Medicine and International Health 4, A28–A33.CrossRefGoogle Scholar
  3. Branagan D. (1973) Observations on the development and survival of the ixodid tick Rhipicephalus appendiculatus (Neumann, 1901) under quasi-natural conditions in Kenya. Tropical Animal Health Production 5, 153–165.CrossRefGoogle Scholar
  4. Brocklesby D. W., Barnett S. R and Scott G. R. (1961) Morbidity and mortality rates of East Coast fever (Theileria parva infection) and their application to drug screening procedures. British Veterinary Journal 117, 529–531.CrossRefGoogle Scholar
  5. Büscher G. and Otim B. (1986) Quantitative studies on Theileria parva in the salivary glands of Rhipicephalus appendiculatus adults: Quantitation and prediction of infection. International Journal for Parasitology 16, 93–100.CrossRefGoogle Scholar
  6. Dallwitz M. J., Young A. S., Mahoney D. E and Sutherst R. W. (1986) Comparative epidemiology of tick-borne disease with special emphasis on modelling, pp. 629–637. In Parasitology Quo Vadis (Edited by M. J. Howell). Australian Academy of Science, Canberra.Google Scholar
  7. Dolan T. T., Young A. S., Losos G. J., McMillan I., Minder C. H. E. and Soulsby K. (1984) Dose dependent responses of cattle to Theileria parva stabilate infection. International Journal for Parasitology 14, 89–95.CrossRefGoogle Scholar
  8. Fielden L. J. and Rechav Y. (1996) Survival of six species of African ticks in relation to saturation deficits. Experimental and Applied Acarology 20, 625–637.CrossRefGoogle Scholar
  9. Lewis E. A. (1950) Conditions affecting the East Coast fever parasite in ticks and in cattle. East Africa Agricultural Journal 16, 65–83.CrossRefGoogle Scholar
  10. Lewis E. A. and Fotheringham W. (1941) The transmission of Theileria parva by ticks. Parasitology 33, 251–277.CrossRefGoogle Scholar
  11. Martin H. M., Barnett S. E and Vidier B. O. (1964) Cyclic development and longevity of Theileria parva in the tick, Rhipicephalus appendiculatus. Experimental Parasitology 15, 527–555.CrossRefGoogle Scholar
  12. Moll G., Lohding A. S., Young A. S. and Leitch B. L. (1986) Epidemiology of theileriosis in calves in an endemic area of Kenya. Veterinary Parasitology 19, 255–273.CrossRefGoogle Scholar
  13. Mukhebi A. W., Perry B. D. and Kruska R. (1992) Estimated economics of theileriosis control in Africa. Preventive Veterinary Medicine 12, 73–85.CrossRefGoogle Scholar
  14. Newson R. M., Chiera J. W., Young A. S., Dolan T. T., Cunningham M. R and Radley D. E. (1984) Survival of Rhipicephalus appendiculatus (Acarina: Ixodidae) and persistence of Theileria parva (Apicomplexa: Theileriidae) in the field. International Journal for Parasitology 14, 483–489.CrossRefGoogle Scholar
  15. Norval R. A. I., Perry B. D. and Young A. S. (1992) The Epidemiology of Theileriosis in Africa. Academic Press, London. 481 pp.Google Scholar
  16. Ochanda H., Young A. S., Wells C., Medley G. E and Perry B. D. (1996) Comparison of the transmission of Theileria parva between different instars of Rhipicephalus appendiculatus. Parasitology 113, 243–253.CrossRefGoogle Scholar
  17. Perry B. D., Lessard P., Norval R. A. I., Kundert K. and Kruska R. (1990) Climate, vegetation and the distribution of Rhipicephalus appendiculatus in Africa. Parasitology Today 6, 100–104.CrossRefGoogle Scholar
  18. Radley D. E., Brown C. G. D., Burridge M. J., Cunningham M. P., Pierce M. A. and Purnell R. E. (1974) East Coast fever: Quantitative studies of Theileria parva in cattle. Experimental Parasitology 36, 278–287.CrossRefGoogle Scholar
  19. Theiler A. (1905) Further experiments to note how long an area remains infected with East Coast fever. Transvaal Journal of Agriculture 3, 700–706.Google Scholar
  20. Uilenberg G. (1999) Immunization of diseases caused by Theileria parva: A review. Tropical Medicine and International Health 4, A12–A20.CrossRefGoogle Scholar
  21. Young A. S. and Leitch B. L. (1981) Epidemiology of East Coast fever: Some effects of temperature on the development of Theileria parva in the tick vector, Rhipicephalus appendiculatus. Parasitology 83, 199–211.CrossRefGoogle Scholar
  22. Young A. S., Leitch B. L., Dolan T. T., Newson R. M., Ngumi P. L. and Omwoyo P. L. (1983) Transmission of Theileria parva by a population of Rhipicephalus appendiculatus under simulated natural conditions. Parasitology 86, 255–267.CrossRefGoogle Scholar
  23. Young A. S., Leitch B. L., Morzaria S. P., Irvin A. D., Omwoyo P. L. and De Castro J. J. (1987) Development and survival of Theileria parva parva in Rhipicephalus appendiculatus exposed in the Trans-Mara, Kenya. Parasitology 94, 433–441.CrossRefGoogle Scholar

Copyright information

© ICIPE 2006

Authors and Affiliations

  1. 1.Department of ZoologyUniversity of NairobiNairobiKenya

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