Twelve-year survey of bovine abortion caused by Arcanobacterium pyrogenes in Chiba prefecture [Japan]
2002
Hirahata, J. (Chiba-ken. Government Office (Japan)) | Murakami, S. | Ogawa, A. | Hara, H. | Shimada, J.
Between January 1998 and June 1999, on a certain dairy farm in Chiba Prefecture, 10 cows aborted. Examinations performed on 7 of them revealed 2 fetuses with subcutaneous edema, hyperemia or hemorrhage, and significantly in creased serosanguinous fluids in the body cavities. The main histopathological lesions observed in the fetuses were purulent bronchopneumonia with bacterial clumps reacting positively when submitted to Gram's method. Bacterial clumps in purulent lesions were immunolabeled with anti-Arcanobacterium pyogenes serum. A. pyogenes was isolated purlely from the 2 fetuses already mentioned and from the uterus of another case. We have surveyed retrospectively 181 abnormal bovine parturition for the past 12 years-including the ones dealt with here-in Chiba Prefecture. Of them, 8 (4.4%) were diagnosed as infected with A. pyogenes. These abortions seemed to occur after the third gestation, frequently from spring to early summer.
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