A Field Survey on Antibody against Hog Cholera Virus in Shizuoka Prefecture

Abstract

Antibody against hog cholera virus was examined, the virus-neutralizing test, in market pigs from 1976 to 1982, and in breeder pigs in 1981. The positive rate of market pigs ranged from 86.9%(193/224) to 95.4%(274/287) in each year, indcating that the vaccination seemed to be well done in Shizuoka Prefecture. The maternal antibody-titer of piglet as estimated from breeders, indicated that 86% of the pigs took hog cholera live vaccine at 23 days of age, and that 77.2% had been protected from the field infection. The rate of vaccinated pigs, as estimated from the numbers of breeder pigs and inoculated pigs, was above 90% in each year. Especially high levels (96.8-98.1%) were shown in 1980 and later.