Clifton-Hadley F A, Alexander T J, Enright M R, Guise J
Vet Rec. 1984 Dec 1;115(22):562-4. doi: 10.1136/vr.115.22.562.
Heads were removed soon after slaughter from the dressed carcases of 155 pigs belonging to 12 herds with a history of streptococcal meningitis and from 180 pigs from four herds believed to be free from this disease. Deep scrapings from both tonsils were sown on two selective media. Streptococcus suis type 2 was detected in a proportion of pigs from the 12 herds with a history of the disease, including three herds in which no cases were noted during the year this study was made. Pigs in six of these herds had received therapeutic levels of certain antibiotics in their feed as growers. The confirmed detectable tonsillar carrier rates varied between these 12 herds from 20 to 90 per cent and between batches of heads from one herd from 0 to 100 per cent. Carrier rates could not be correlated with disease levels, herd size or husbandry system. S suis type 2 was also detected in pigs from two herds thought to be free of the disease, at rates of 20 and 1.5 per cent.
从12个有链球菌性脑膜炎病史的猪群的155头屠宰后的猪胴体上，以及从4个据信无此病的猪群的180头猪身上，屠宰后不久就取下了猪头。从两侧扁桃体进行深度刮取物接种于两种选择性培养基上。在有该病病史的12个猪群的一部分猪中检测到了2型猪链球菌，其中包括在本研究进行的这一年中未发现病例的3个猪群。这些猪群中有6个猪群的育肥猪在饲料中接受了治疗剂量的某些抗生素。这12个猪群中确诊的可检测扁桃体带菌率在20%至90%之间，而来自一个猪群的不同批次猪头的带菌率在0%至100%之间。带菌率与疾病水平、猪群规模或饲养系统无关。在两个据信无此病的猪群的猪中也检测到了2型猪链球菌，检出率分别为20%和1.5%。
