Yeruham I, Braverman Y, Shpigel N Y, Chizov-Ginzburg A, Saran A, Winkler M
Koret School of Veterinary Medicine, Hebrew University of Jerusalem, Bet Dagan, Israel.
Vet Q. 1996 Sep;18(3):87-9. doi: 10.1080/01652176.1996.9694623.
Morbidity due to Corynebacterium pseudotuberculosis infection occurred in 29 dairy herds. The disease appeared basically in three clinical forms: cutaneous, mastitic, and visceral. The appearance of the disease showed a marked seasonality: in 23 herds it occurred during the spring and summer months (dry season) (March-October). The mastitic form occurred in only 10 herds and the causative bacterium was isolated from 33 cows (5.8%). All the strains of C. pseudotuberculosis isolated from the milk samples were found not to be nitrate reducers. The bacterium was excreted in the milk of six cows from herd B during a period of 11 months. In the mastitic cows, a decrease in milk production and considerable increases in the somatic cell count were noted. C. pseudotuberculosis was isolated from houseflies collected over a cow lesion. Laboratory-reared houseflies were successfully infected with C. pseudotuberculosis-contaminated milk, broth and sugar cubes. Flies infected with the bacterium from contaminated milk excreted the bacterium in their droppings for up to 4 h and from their saliva for up to 3 h post infection. The bacterium survived on the external organs of houseflies for no longer than 10 min post infection, after the flies had been dipped in contaminated broth.
29个奶牛群发生了由伪结核棒状杆菌感染引起的发病情况。该病主要表现为三种临床形式：皮肤型、乳房炎型和内脏型。该病的出现呈现出明显的季节性：在23个牛群中，发病发生在春季和夏季月份（旱季）（3月至10月）。乳房炎型仅发生在10个牛群中，从33头奶牛（5.8%）中分离出了致病细菌。从牛奶样本中分离出的所有伪结核棒状杆菌菌株均未发现是硝酸盐还原菌。在11个月的时间里，从牛群B的6头奶牛的牛奶中排出了该细菌。在患乳房炎的奶牛中，观察到产奶量下降，体细胞计数显著增加。从奶牛病变部位采集的家蝇中分离出了伪结核棒状杆菌。实验室饲养的家蝇成功感染了被伪结核棒状杆菌污染的牛奶、肉汤和糖块。感染了来自受污染牛奶中的细菌的家蝇在感染后长达4小时通过粪便排出细菌，长达3小时通过唾液排出细菌。在将家蝇浸入受污染的肉汤后，该细菌在感染后在家蝇的外部器官上存活不超过10分钟。
