A Study on Immune Response after Vaccination and the Status of Classic Swine Fever (CSF) in Kontum Province

Abstract

In Kon Tum provine, classic swine fever (CSF) vaccination has been  applied to pigs every year. However, the disease still occurs with untypical clinic signs.  Results of ELISA test to identify antibody of CSF showed that the situation of immunity against CSF on pig herds warranted consideration. The protection rate of immunity  in vaccinated pigs varried among the studied zones, the highest being in zone III (30.0%), followed by zone II (20.0%), and the lowest being in zone I (15.0%). The rate of protection was 72.73% 64.77%, and 11.94% for boars and sows and  porkers, respectively. There was a downward trend in immune response  over time: The rate of protection was 77.50%; 77.39% and 34.21%, respectively after 21 days, 90 days, and 180 days of vaccination. The occurrence and the spread of CSF in this province were caused by  various reasons such as local reservoirs (46.15%); transmition from other districts (9.40%) and from other provinces (11.11%).  The incidence of CFS was different  among ecological zones, the highest  being in zone I (3.60%), followed by zone II (1.41%) and the lowest being in zone III (1.32%)