Kudo H, Yoshizawa S, Hiroike T, Hirose O
Chiba Serum Institute, Japan.
J Vet Med Sci. 1995 Aug;57(4):793-5. doi: 10.1292/jvms.57.793.
One thousand two hundred and forty pigs' sera collected from 1975 to 1992 on 240 farms in Chiba prefecture were subjected to a neutralization test for the encephalomyocarditis (EMC) virus. Seven (23.3%) of 30 pigs in 1975 had neutralizing antibodies against the EMC virus. The antibody positive rates each year ranged from 16.7% (1976) to 56.3% (1981). The differences of antibody positive rates between districts were not great after 1985. These serological results suggested that the EMC virus infection had already been introduced by 1975 and that it is prevalent among pigs in Chiba prefecture.
1975年至1992年间，从千叶县240个农场收集了1240份猪血清，对其进行脑心肌炎（EMC）病毒中和试验。1975年30头猪中有7头（23.3%）具有针对EMC病毒的中和抗体。每年的抗体阳性率在16.7%（1976年）至56.3%（1981年）之间。1985年后各地区抗体阳性率差异不大。这些血清学结果表明，EMC病毒感染在1975年之前就已传入，且在千叶县的猪中普遍存在。
