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An outbreak of a fatal haemolytic anaemia in a dairy herd of cattle in Switzerland was shown to be associated with infections with five vector-borne pathogens, namely Anaplasma marginale, A. phagocytophilum, Babesia bigemina, a Theileria spp belonging to the buffeli/sergenti/orientalis complex and haemotrophic Mycoplasma spp. The latter three had not been documented before this outbreak in Switzerland. To characterise the haematological and blood chemical changes in these unique cows, packed cell volume was determined in all 286 blood samples, blood smears, and complete haematology were performed from 285 and 173 blood samples, respectively, and biochemical parameters were assayed in 105 serum samples. Regenerative anaemia was the key sign of illness. Red blood cells of anaemic cattle were hypochromic and macrocytic. Anaemic animals had reduced platelet cell counts and increased total white cell counts. In addition, increased serum bilirubin, blood aspartate aminotransferase, gamma glutamyltransferase, glutamic dehydrogenase and blood urea nitrogen and decreased magnesium, calcium and albumin levels were found in anaemic cattle when compared to animals with normal packed cell volume. Most changes could not be attributed to a single infection. A. marginale seemed to be important in causing the outbreak, but co-infections may have aggravated the disease development and clinical signs. Thus, when encountering cattle with haemolytic anaemia, all of the mentioned pathogens should be included as differential diagnosis.
Comparative Clinical Pathology – Springer Journals
Published: Dec 12, 2007
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