Jensen N E
Nord Vet Med. 1982 Dec;34(12):441-50.
Intramammary infections with Group-B streptococci of human and bovine origin were produced experimentally in cows. The initial cytological response was more rapid to the human than to the bovine strain (Table I), while at later stages the pathological changes induced by the two infections were much the same (Fig. 1). The initial clinical reaction was more acute to the "human" than to the "bovine" infections and the average daily loss of milk was greater in cases of "human" infection than in cases of "bovine" infection (Table II). In contrast to the "bovine" infections the "human" infections showed a pronounced tendency to spontaneous clearance. The rate of excretion of Group-B streptococci with the milk was lower for the "human" than for the "bovine" infections (Table III). The special mode of reaction of the bovine udder against infections with Group-B streptococci of human origin may, in part, explain why such infections have a lower tendency to spread within a herd than infections with bovine strains of B-streptococci.
用人源和牛源B族链球菌对奶牛进行乳房内感染实验。最初的细胞学反应对人源菌株比对牛源菌株更快（表I），而在后期阶段，两种感染诱导的病理变化大致相同（图1）。最初的临床反应对“人源”感染比对“牛源”感染更急性，并且“人源”感染病例的平均每日产奶损失比“牛源”感染病例更大（表II）。与“牛源”感染相反，“人源”感染表现出明显的自发清除倾向。“人源”感染的B族链球菌随乳汁排出的速率低于“牛源”感染（表III）。奶牛乳房对人源B族链球菌感染的特殊反应模式，可能部分解释了为什么此类感染在牛群中传播的倾向低于牛源B族链球菌感染。
