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Laboratory reared Amblyomma hebraeum and Amblyomma variegatum ticks differ in their susceptibility to infection with Cowdria ruminantium

Published online by Cambridge University Press:  15 May 2009

S. M. Mahan ,
T. F. Peter ,
S. M. Semu ,
B. H. Simbi ,
R. A. I. Norval  and
A. F. Barbet
S. M. Mahan
Affiliation:
University of Florida/United States Agency for International Development/South African Development Cooperation, Heartwater Research Project, Box CY 551 Causeway, Harare, Zimbabwe.
T. F. Peter
Affiliation:
University of Florida/United States Agency for International Development/South African Development Cooperation, Heartwater Research Project, Box CY 551 Causeway, Harare, Zimbabwe.
S. M. Semu
Affiliation:
University of Florida/United States Agency for International Development/South African Development Cooperation, Heartwater Research Project, Box CY 551 Causeway, Harare, Zimbabwe.
B. H. Simbi
Affiliation:
University of Florida/United States Agency for International Development/South African Development Cooperation, Heartwater Research Project, Box CY 551 Causeway, Harare, Zimbabwe.
R. A. I. Norval
Affiliation:
Department of Infectious Diseases, University of Florida, Box 110880, Gainesville. Florida 32611-0880, United States of America
A. F. Barbet
Affiliation:
Department of Infectious Diseases, University of Florida, Box 110880, Gainesville. Florida 32611-0880, United States of America
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The susceptibility of laboratory reared Zimbabwean Amblyomma hebraeum and A. variegatum ticks to infection with geographically distinct Cowdria ruminantium strains was investigated by feeding both species simultaneously on individual sheep infected with one of the four strains (Crystal Springs [Zimbabwe], Ball 3 [South Africa]. Gardel [Guadeloupe] and Nigeria [Nigeria]). A. hebraeum ticks demonstrated a high susceptibility to infection with all four C. ruminantium strains. In comparison. A. variegatum were less susceptible to infection with the Crystal Springs and Ball 3 strains (P < 0·001), but showed a similar susceptibility to the Gardel and Nigeria strains. The differences in susceptibility of A. variegatum to infection with the four strains of C. ruminantium correlated with the origin of these strains. The consistently higher susceptibility of A. hebraeum ticks to infection with geographically different C. ruminantium strains may be one explanation for the observation that heartwater is a more serious problem where A. hebraeiun is the vector of the disease.

Type
Research Article
Information
Epidemiology & Infection , Volume 115 , Issue 2 , October 1995 , pp. 345 - 353
Copyright
Copyright © Cambridge University Press 1995

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