Journal of Vaccines & Vaccination

Transmission of LOM vaccine strain for classical swine fever in Jeju Island in South Korea

Joint Event on 31^st Euro Global Summit and Expo on Vaccines & Vaccination & 4^th World Congress and Exhibition on Antibiotics and Antibiotic Resistance

June 14-16, 2018 Barcelona, Spain

Wooseog Jeong, Sungdae Park, Yong-Myung Kang and Jihye Kim

Animal and Plant Quarantine Agency, South Korea

Posters & Accepted Abstracts: J Vaccines Vaccin

Abstract:

Classical swine fever (CSF) is an economically important, highly contagious disease of swine worldwide. CSF is caused by classical swine fever virus (CSFV) and domestic pigs and wild boars are its only natural hosts. In South Korea, a live attenuated vaccine (LOM strain) had been used to control CSF from 1974 and declared to CSF-free and stopped vaccination in 2001. But due to CSF outbreak again in 2003, nationwide CSF vaccination campaign has been performed since then. But Jeju Island located in Southern Korea was excluded from the CSF vaccination campaign. In 2004, LOM vaccine strain was detected in Jeju Island due to blood meals, and it was detected in 47 farms until 2007. It was recently detected in 20 farms through the vaccination of contaminated vaccine against LOM vaccine in 2014, 25 farms (cumulative) in 2015, 34 farms (cumulative) in 2016, and 22 farms (cumulative) in 2017. In addition to public vehicle sterilizers, disinfection facilities for interception and prevention of each farm are very inadequate. Among the Hanlim area complexes, feed, animal medicine, pregnancy diagnosis, and manure handling are shared with each other. Chronic diseases such as PRRS and PED are spreading. Among the 58 farms detected in the LOM, 42 farms were suspected to have PED, of which 28 farms (48.3%) conducted PED self-vaccination using intestine of PED positive pigs. The farmers claim to be fever, diarrhea and mortality as the main clinical symptoms of pigs infected with the LOM vaccine. Epidemiological studies through network analysis have shown that the affected farms were infected with chronic wasting diseases such as PED and that they had the characteristics of sharing manure disposal plants and vehicles in the nearby areas. It is known that LOM vaccine infection through oral administration is feasible. In the case of individuals whose immunity is weakened by PED or the like, it can be infected if it is exposed to contaminated source through a manure vehicle and so on. There is only one slaughterhouse in Jeju Island; it is possible to spread to Jeju Island through slaughterhouses. However, the detection of LOM vaccine in some areas only suggests that it is possible to spread only in special circumstances in the region. wjeong@korea.kr