The Passage of "Theileria Lawrencei (Kenya)" Through Cattle

No Thumbnail Available
Date
1966
Authors
BARNETT,S. F.
BROCKLESBy,D. W.
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
A theilerial parasite, "Theileria lawrencei (Kenya)", isolated from a wild Mrican Buffalo (Syncerus caifer) in engorged Rhipicephalus appendiculatus nymphae, was passaged through cattle via the same species of tick. The parasite on first isolation in cattle had all the accepted criteria of T. lawrencei. Recovery from infection provided a strong immunity to subsequent challenge with Theileria parva. One animal infected ticks three months and fifteen months after recovery: these ticks transmitted a theilerial infection to cattle indistinguishable from East Coast Fever. Passage of "T. lawrencei (Kenya)" through cattle resulted in profound changes. The most important of these were (I) an increase in piroplasm production; (2) an increase in the numbers of macroschizonts; (3) an increase in the numbers of microschizonts, and (4) an increase in the average size of the macroschizonts. These changes meant that" T. lawrencei (Kenya)" had become indistinguishable from T. parva, and therefore the validity of T. lawrencei as a species cannot be supported. The Mrican Buffalo must be regarded as a reservoir of East Coast Fever.
Description
Keywords
Citation
The Veterinary Journal, 122, p. 396-409
Collections