Korean Journal of Veterinary Research (대한수의학회지)

The Korean Society of Veterinary Science (대한수의학회)
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Infection patterns of porcine reproductive and respiratory syndrome virus by serological analysis on a farm level

혈청학적 분석을 통한 돼지 생식기호흡기증후군의 농장단위 감염유형

  • Park, Choi-Kyu (National Veterinary Research and Quarantine Services) ;
  • Yoon, Ha-Chung (National Veterinary Research and Quarantine Services) ;
  • Lee, Chang-Hee (College of Natural Sciences, Kyungpook National University) ;
  • Jung, Byeong-Yeal (National Veterinary Research and Quarantine Services) ;
  • Lee, Kyoung-Ki (National Veterinary Research and Quarantine Services) ;
  • Kim, Hyun-Soo (College of Veterinary Medicine, Chungnam National University)
  • Accepted : 2008.01.17
  • Published : 2008.03.30
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Abstract

Porcine reproductive and respiratory syndrome (PRRS) is the most economically important viral infectious disease in pig populations worldwide. This study was conducted to better understand the epidemic and dynamics of PRRS virus (PRRSV) on each farm and to evaluate the risk of PRRSV infection in Korea. Interviews with pig farmers were carried out to obtain PRRS vaccination programmes in 60 pig farms throughout Korea. Blood samples were also collected from the 59 pig farms to investigate outbreak patterns of each farm. Vaccination against PRRS was performed in 16.7% farms for breeding pigs and 8.3% of farms for nursery pigs. According to the seroepidemiological analysis, 56 (94.9%) out of 59 farms were considered to be affected by PRRSV infection. The results revealed that 68.9% of sows tested were seroconverted and interestingly, gilt herds had the highest seropositive rate (73%), suggesting that gilts may play a key role in PRRSV transmission in sow herds. Among the PRRS-affected piglet herds, 33 (55.9%), 14 (23.7%) and 6 (10.2%) farms were initially infected with PRRSV during the weaning, suckling and nursery period, respectively. It seems likely, therefore, that PRRSV infection predominantly occurs around the weaning period in piglet herds. Based on antibody seroprevalence levels in both sow and piglet groups, we were able to classify patterns of PRRSV infection per farm unit into 4 categories; category 1 (stable sow groups and non-infected piglet groups), category 2 (unstable sow groups and non-infected piglet groups), category 3 (stable sow groups and infected piglet groups), and category 4 (unstable sow groups and infected piglet groups). Our data suggested that 43 (72.9%) farms were analysed to belong to category 4, which is considered to be at high-risk for PRRS outbreak. Taken together, our information from this study will provide insight into the establishment of an effective control strategy for PRRS on the field.

Keywords

References

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