Study on some indexes controlling classical swine fever virus before and after vaccination in some localities of Kon Tum city, Kon Tum province in 2014-2015

Abstract

We have used two IHA and SSIA methods for investigating and identifying some indexes related to vaccination immunity and classical swine fever virus (CSFV) infection in pig rearing in two wards and two communes in Kon Tum city of Kon Tum province. The studied result showed that at the end of 2014 the antibody-carrying pig rate in 4 wards/communes was 90.63%. The antibody-carrying pig rate reaching antibody titers not lower than the estimated effective level (EEL) of 4log2 was 55.3%. The rate of pig infected with CSF virus in whole 4 wards and communes were 33.13%, respectively, with the infection intensity was 1.37 (for whole wards/communes). At the day 10th after inoculation with CSF vaccine, all of indices changed, such as:the antibody-carrying pig rate was 98.13% (for whole wards/communes). The antibody-carrying pig rate reaching antibody titer not lower than the estimated effective level (EEL) of 4log2 was 81.88% (for whole wards/communes). The rate of pig infected with CSF virus was 19.38% (for whole wards/communes). Besides, the correlation coefficient between the antibody-carrying pig rate reaching 4log2 and the CSF virus infected rate in before and after vaccination was -0.8 and -1 respectively. From the research results we could conclude that 1) there was strongly opposite correlation between the antibody-carrying pig rate reaching 4log2 and the CSF virus infected rate and 2). Experimental vaccination has given the efficacy in terms of antibody conversion and reduction of the CSF virus carrying pig rate.