丹麦某地区牛群和奶牛中B族链球菌血清型的分布情况
Distribution of serotypes of group-B streptococci in herds and cows within an area of Denmark.
作者信息
Jensen N E
出版信息
Acta Vet Scand. 1980;21(3):354-66. doi: 10.1186/BF03546867.
During a 3-year period strains of Group-B streptococci from 1227 (94.6 %) of a total of 1297 cases of bovine mastitis were serologically typed. Twenty-seven different antigenic combinations were found. Ab. 70 % of the strains carried polysaccharide antigens among which Type III was predominant (57 % The protein antigen X was widespread (62 %), and 5 % of the strains were non-type able. Type Ic predominated among “false positive” bulk milk isolates (52.2 %, 12/23), but was rarely isolated from quarter milk samples (3%). Variation in the antigenic structure of infecting strains occurred to some extent and involved at least 10.8 (132/1227) and probably 25.2 (132/523) of the strains. Within a herd the antigenic variation was limited, however. Hence a definition of a herd type was possible. During the period of investigation infections caused by Herd Type III decreased numerically while the number of herds infected by other types remained almost stable.
在3年期间，对1297例牛乳腺炎病例中1227例（94.6%）的B族链球菌菌株进行了血清学分型。发现了27种不同的抗原组合。约70%的菌株携带多糖抗原，其中III型占主导（57%）。蛋白抗原X广泛存在（62%），5%的菌株无法分型。Ic型在“假阳性”混合奶分离株中占主导（52.2%，12/23），但很少从乳区奶样中分离到（3%）。感染菌株的抗原结构在一定程度上发生了变化，至少涉及10.8%（132/1227）且可能25.2%（132/523）的菌株。然而，在一个牛群中抗原变异是有限的。因此，可以定义牛群型。在调查期间，III型牛群引起的感染数量减少，而其他类型感染的牛群数量几乎保持稳定。
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