Seroprevalence and epidemiological analysis of porcine reproductive and respiratory syndrome virus in Korea

Park, C.K.; Chang, C.H.; Kang, Y.B. .; Lee, C.H. . Department of Veterinary Medicine; Lyoo, Y.S. . School of Veterinary Medicine; Kim, H.S. . College of Veterinary Medicine

Seroprevalence and epidemiological analysis of porcine reproductive and respiratory syndrome virus in Korea

1999

Park, C.K. | Chang, C.H. | Kang, Y.B. (National Veterinary Reseach and Quarantine Service, Anyang (Korea Republic).) | Lee, C.H. (Cheju National University, Cheju (Korea Republic). Department of Veterinary Medicine) | Lyoo, Y.S. (Kon-Kuk University, Seoul (Korea Republic). School of Veterinary Medicine) | Kim, H.S. (Chungnam National University, Taejon (Korea Republic). College of Veterinary Medicine)

A nation wide sero-epidemiological survery of porcine reproductive and respiratory syndrome(PRRS) was carried out to analyze the current status of the PRRS virus infections in the field using the indirectr immunofluorescent antibody assay(IFA) with the field isolate PL96-1. Since the first report of the antibody detection to PRRSV in 1993, the prevalence of seropositive pigs has increased dramatically and the data indicate that over 21% of the pigs and around 60% of the farms showed seropositives to the PRRS virus. A slightly higher positive rate was recognized in breeders than fattenings and it might be due to the higher age at the time of testings. No significant regionl defferences were detected in the sero-epidemiological survey. Higher sero-positive rate in growers indicatesthat PRRSV infection in the field was common after weaning(around 40 days). However, the number of seropositive pigs were declined in fattening pigs. Sows showed around 26% of sero-positive rate that there is a higher chance of continuous virus circulation in the infected farms. Low rate of sero-positivity in boars(9.8%) implies that there is high demand in proper controlmeasures to prevent virus spreading through breeding procedures such as natural or artificial insemination Therefore it was concluded that PRRSV infection in domestic swine herds is endemic and the positive rate and economic loses will be increased by spontaeous infections in naive farms.

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