Publications

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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
the tick vectors of cowdria ruminantium (ixodoidea, ixodidae, genus amblyomma) and their distribution.twelve species of amblyomma are presently known to be capable of transmitting cowdria ruminantium. of these a. variegatum is the most important and widely distributed vector in africa. it has also extended its range considerably outside this continent, eastward to the yemen arab republic and to the islands of madagascar, réunion and mauritius, and westward to the cape verde islands and to some of the west indian islands. a. hebraeum is probably the only field vector in most parts of southern afr ...19873329325
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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