Wilson C D, Richards M S
Vet Rec. 1980 May 24;106(21):431-5. doi: 10.1136/vr.106.21.431.
Five hundred herds were examined to determine the prevalence of subclinical mastitis in the British dairy herd. The prevalences of the various infections recorded were Streptococcus agalactiae 3.4 per cent of quarters, S dysgalactiae 1.1 per cent, S uberis 1.5 per cent and Staphylococcus pyogenes 8.1 per cent. There were regional differences in the prevalence of some of these pathogens. The national prevalence of subclinical mastitis as defined by the International Dairy Federation was 9.6 per cent of all quarters. Udder infections were less prevalent in herds where mastitis control measures were being used. The prevalence of infection also declined as the size of herd increased. However, as the uptake of mastitis control measures was greater in the larger herds it seems likely that the widespread use of control measures was the most important factor responsible for the relatively low prevalence of subclinical mastitis.
对500个牛群进行了检查，以确定英国奶牛群中亚临床型乳腺炎的患病率。记录的各种感染的患病率分别为：无乳链球菌占季度患病率的3.4%，停乳链球菌占1.1%，乳房链球菌占1.5%，化脓性葡萄球菌占8.1%。其中一些病原体的患病率存在地区差异。根据国际乳品联合会的定义，全国亚临床型乳腺炎的患病率为所有季度的9.6%。在采用乳腺炎控制措施的牛群中，乳房感染的患病率较低。感染的患病率也随着牛群规模的增加而下降。然而，由于较大牛群中乳腺炎控制措施的采用率更高，因此控制措施的广泛使用似乎是亚临床型乳腺炎患病率相对较低的最重要因素。
