Increased pathogenicity of an Ehrlichia-like agent after passage through Amblyomma hebraeum: a preliminary report

After being passaged through 3 generations of Amblyomma hebraeum, an Ehrlichia-like agent isolated from an adult Hyalomma truncatum female became more pathogenic and elicited a disease in sheep indistinguishable from heartwater. Cross-immunity between this agent and several stocks of Cowdria ruminan...

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Bibliographic Details
Published in:Onderstepoort journal of veterinary research Vol. 57; no. 4; p. 233
Main Author: du Plessis, J L
Format: Journal Article
Language:English
Published: South Africa 01.12.1990
Subjects:
Animals
Cattle
Cattle Diseases - etiology
Cross Reactions
Ehrlichia - immunology
Ehrlichia - pathogenicity
Rickettsia - immunology
Rickettsiaceae Infections - etiology
Rickettsiaceae Infections - veterinary
Serial Passage
Sheep
Sheep Diseases - etiology
Ticks - microbiology
ISSN:0030-2465
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Summary:After being passaged through 3 generations of Amblyomma hebraeum, an Ehrlichia-like agent isolated from an adult Hyalomma truncatum female became more pathogenic and elicited a disease in sheep indistinguishable from heartwater. Cross-immunity between this agent and several stocks of Cowdria ruminantium and high levels of antibody elicited by the agent against 2 stocks of C. ruminantium in the indirect fluorescent antibody test, confirmed its close relationship to Cowdria.
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ISSN:0030-2465