heartwater (cowdria ruminantium infection) on são tomé.the supernatant obtained after centrifugation of an emulsion of engorged female amblyomma astrion ticks, collected from cattle on the west african island of são tomé, was injected intravenously into a goat, which contracted heartwater. this confirmation of the existence of the disease on the island makes strict control measures necessary if present efforts at improving livestock production by imported exotic cattle are to be successful.19827147672
cross immunity between strains of cowdria ruminantium.cross immunity tests with strains of cowdria ruminantium from south africa, the sudan, são tomé and nigeria failed to demonstrate antigenic differences. the antibiotic ampicillin showed no activity against heartwater.19836195703
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