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Heartwater -- South Africa (43) |
Veterinary medicine (43) |
Veterinary medicine -- South Africa (43) |
Heartwater (6) |
Tick-borne diseases in animals (4) |
Amblyomma hebraeum (2) |
Cowdria ruminantium (2) |
Cycloheximide (2) |
Ehrlichia (Cowdria) ruminantium (2) |
In vitro cultivation (2) |
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