Bacterial Infection Linked To Abortions In Japanese Mares

Mycobacterial infections, which are generally uncommon in horses, have been linked to ten abortions in Japanese mares. The mares were housed on seven Thoroughbred farms in the Hidaka district of Hokkaido. There were no reports of direct contact between the horses.

Dr. Yuta Kinoshita studied the abortions, which took place from 2018 to 2019. Most of the placentas had a yellowish-white exudate on them and included considerable lesions. Lesions aren’t common with pathogenic bacteria like Streptococcus zooepidemicus and Escherichia coli.

Researchers located Mycobacterial granulomas on the placenta and the fetal organs. Bacterial samples were taken from both of these areas, with the greatest number of bacteria found in the necrotic placental lesions. The bacteria were genetically tested and identified as Mycobacterium avium subsp. hominissuis. The strains were all identical, suggesting that the horses had been infected by the same unknown contagious source.

Read the case report here.

Read more at HorseTalk.

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