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The epidemiology of bluetongue in Malawi

Published online by Cambridge University Press:  19 October 2009

J. M. Haresnape ,
W. P. Taylor  and
S. A. M. Lungu
J. M. Haresnape
Affiliation:
Central Veterinary Laboratory, P.O. Box 527, Lilongwe, Malawi
W. P. Taylor
Affiliation:
Institute for Animal Disease Research, Pirhright Laboratory, Ash Road, Pirbright, Surrey, UK
S. A. M. Lungu
Affiliation:
Central Veterinary Laboratory, P.O. Box 527, Lilongwe, Malawi
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Summary

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A 4 year survey was undertaken in 1982–6 to examine the seasonal nature of bluetongue virus activity in Malawi. Bluetongue infection at Bwemba in Lilongwe district and Likasi in Mchinji district, both in the Central Region of Malawi, was detected by examining sera taken from calves at each site, at monthly intervals. The proportion of seronegative calves undergoing serocon version each month was used as a measure of virus activity. At both sides bluetongue virus activity was found to be most marked during the rainy season, with no activity detected during the dry season from July to September. Thus the pattern of bluetongue infection in Malawi is highly seasonal. Examination of type-specific neutralizing antibody showed that the prevalent serotypes varied from year to year.

Type
Research Article
Information
Epidemiology & Infection , Volume 100 , Issue 3 , June 1988 , pp. 493 - 499
Copyright
Copyright © Cambridge University Press 1988

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