한국가금학회지 (Korean Journal of Poultry Science)

  • 제46권4호
  • /
  • Pages.235-247
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  • 2019
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  • 1225-6625(pISSN)
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  • 2287-5387(eISSN)
한국가금학회 (The Korean Society of Poultry Science)
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국내 산란계의 주요 전염성 질병에 대한 혈청학적 모니터링

Serological Monitoring of Major Infectious Diseases in the Domestic Layers

  • Min, Bong Chul (Department of Veterinary Medicine, Chungbuk National University) ;
  • Dam, Lai Van (Department of Veterinary Medicine, Chungbuk National University) ;
  • Kim, Kang San (Department of Veterinary Medicine, Chungbuk National University) ;
  • Kim, Tae Sik (Department of Veterinary Medicine, Chungbuk National University) ;
  • Son, Joo Sung (Department of Veterinary Medicine, Chungbuk National University) ;
  • Mo, In Pil (Department of Veterinary Medicine, Chungbuk National University)
  • 투고 : 2019.09.10
  • 심사 : 2019.10.16
  • 발행 : 2019.12.31
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초록

본 연구에서는 국내 산란계의 주요 질병에 대한 면역상태 및 역가수준을 파악하기 위해 2015년부터 2017년까지 3년간 충북대 수의과대학 조류질병학 실험실에 의뢰된 산란계의 혈청을 성장기와 산란기를 고려하여 주령별로 구분하여 분석하였고, 계절에 따른 검사결과를 분석하였다. 검사대상 질병은 검사 의뢰건 수가 많고, 혈청검사 결과가 유의미한 질병인 LPAI, ND, IB, aMPV, EDS'76, IBD, CIA, MS로 한정하였다. AI와 ND의 경우 전체적인 GMT, CV의 양상은 비슷하게 진행되었다. 반면 LPAI의 경우 주령별 계군양성율이 불균일하고 편차가 최대 약 50%의 큰 차이를 보였지만 ND의 경우 균일한 양성률을 보이며 편차는 2% 미만으로 낮게 확인되었다. 또한, 전체적인 GMT 역시 LPAI가 ND에 비하여 낮게 형성됨을 확인하였다. 이는 각 질병의 특성과 백신접종의 차이에 따른 결과로 판단된다. IB는 음성계군과 전체계군을 비교할 때 전체 계군의 역가수준이 전반적으로 높았고, CV값은 낮은 경향을 확인할 수 있었으며, 이를 통해 야외 IB virus의 노출을 추정할 수 있었다. aMPV는 2011년에 백신 출시 이후 과거에 비해 높은 항체양성률과 GMT역가 상승을 확인할 수 있었다. EDS'76은 전주령 구간 균일한 역가분포를 나타내었고, 백신에 의한 역가형성을 확인할 수 있었다. IBD는 0~1.5주령의 어린 일령에서 전반적인 IBD 모체이행항체가 높은 수준의 양성률을 보였고 3주령 이후 높게 형성되는 양성률이 모체이행항체수준을 높이는 것으로 추정되고, 향후 지속적인 혈청학적 모니터링이 진행되어야 하겠다. MS는 2017년 백신 출시 이후 양성률과 역가가 높게 나타나는 결과를 보였지만 의뢰건 수가 적고 백신 도입 초기이기 때문에 지속적인 모니터링이 필요하다.

Serological monitoring has been conducted worldwide for early diagnosis of disease and monitoring of immune status in poultry. This study was conducted to evaluate the immune status of layers with sera submitted to the Avian Disease Laboratory, Chungbuk National University from 2015 to 2017. The test results were analyzed by the time submitted and by the age of the chicks. Low pathogenic avian influenza (LPAI) showed a low positive rate of antibody compared with those of Newcastle disease, indicating that domestic vaccination against LPAI was not sufficient. The antibody profile of infectious bronchitis (IB) depicted high level of titer and a low tendency of CV as compared to the uninfected control flocks, which indicated that most layer farms have been exposed to the field IB virus. In case of avian metapneumovirus infection (aMPV) and Mycoplasma synoviae (MS), since the introduction of the vaccine in 2011 and 2017, respectively, the positive rate and the titer level were higher than those in pevious times. No significant difference in the changes of seasonal result was observed, indicating proper vaccination and improvement in biosecurity and management.

키워드

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