Animal Health
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Browsing Animal Health by Subject "African buffaloes"
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Item Correlation between the morphology and infectivity of Theileria lawrencei developing in the tick Rhipicephalus appendiculatus(1975) Purnell, R.E.; Kimber, C.D.; Payne, R.C.; Immunological Research on Tick-borne Cattle Diseases and Tick Control Project; East African Veterinary Research OrganizationAdult Rhipicephalus appendiculatus ticks, infected as nymphs by feeding them on an African buffalo harbouring Theileria lawrencei, were applied to the ears of rabbits. Equal numbers of the feeding ticks were removed daily from rabbits and either dissected and processed so that parasites in their salivary glands could be examined morphologically and classified, or ground in Eagle's Minimal Essential Medium, to harvest parasites from the ticks in the resultant supernatant fluid. The infectivity of the supernatant fluid was tested by inoculation of aliquots into groups of susceptible cattle. It was found that supernatant fluids produced from day 0 to day 2 fed ticks were uninfected to cattle but those produced from 3 to 9 days were infective. The most infective supernatant fluid was produced from 6 day fed ticks. The reactions resulting in cattle were correlated with the number and morphology of parasites in sections of salivary glands and it was found that mature parasites coincided with infectivity of the supernatant fluid to cattle. From the reactions in cattle inoculated with supernatant fluids from 5- and 6-day fed ticks it was concluded that this method of harvesting parasites was efficient. Examination of the salivary glands of a representative sample of a T. lawrencei infected tick batch is a potential means of screening material for T. lawrencei stabilates.Item The Incidence of Theilerial Parasites in East African Buffalo (Syncerus caffer)(1978) Young, A.S.; Brown, C.G.D.; Burridge, M.J.; Grootenhuis, G.K.; Kanhau, G.K.; Purnell, R.E.; Stagg, D. A.; Immunological Research on Tick-borne Cattle Diseases and Tick Control Project; East African Veterinary Research Organization245 buffalo from 13 areas of East Africa were examined for theilerial infections, The vast majority of buffalo (97,1%) examined had piroplasms in their erythrocytes. Theileria lawrencei was isolated from the buffalo by tick feeding and cell culture and was found to be common in most of these buffalo populations. Also over 50% of the buffalo had indirect fluorescent antibody (IF A) titres to T. lawrencei. T. mutans was only isolated from 3 buffalo populations but is probably common.Item The Susceptibility of the African Buffalo (Syxcerus Caffer) to Infection with Theileria Parva (Theiler, 1904)(1966) Barnett, S.F.; Brocklesby, D.W.; East African Veterinary Research OrganizationSix African buffaloes were exposed to infection with Theileria parva. Two of them showed no evidence of infection. Two exhibited only lymph node enlargement with parasites detected in smears. One underwent a mild febrile reaction, but no parasites could be found. One animal had a slight fever and parasites were present: ticks collected from this buffalo transmitted typical East Coast Fever to cattle.
