Abstract
Direct fluorescent antibody (DFA) and Giemsa staining of Anaplasma marginale were compared in smears collected serially at post-mortem (PM) from 11 experimentally infected calves. Once smears had been prepared and air-dried they could be held for at least 5 days before staining with either technique with no noticeable change in staining quality. DFA staining was more sensitive in detecting anaplasms in smears than Giemsa staining. Anaplasma spp could be differentiated from Babesia bovis and B. bigemina by DFA staining but there were cross reactions between A. marginale and A. centrale. Blood smears prepared from subcutaneous vessels in the legs provided better diagnostic material than kidney, heart and lung smears. Brain smears were not suitable for PM diagnosis using either staining technique.
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