Serological investigation and analysis of swine influenza in Liaoning, 2012-2017
LAN De-song1,2,3,4, WEI Su3,4, HOU Zhen-zhong1,2
1. College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, China; 2. China Ministry of Agriculture Key Laboratory of Animal Pathogen Biology, Harbin 150030, China; 3. Liaoning Provincial Center for Animal Disease Prevention and Control, Shenyang 110164, China; 4. Liaoning Animal Medical Research Institute, Shenyang 110164, China
Abstract：In order to investigate the epidemic situation of swine influenza virus (SIV) in large-scale pig farms in Liaoning region, a total of 2 161 swine serum samples were collected from different large-scale pig farms in Liaoning during October 2012 and March 2017, and the antibody titers were detected using the hemagglutination inhibition (HI) tests against the Eurasian avian-like H1N1 (EA H1N1), 2009 H1N1 pandemic (pdm/09 H1N1), H3N2 and H7N9 SIV. The HI tests results showed that the annual positive rates were 29.00%, 49.62%, 42.50%, 3.64%, 1.46%, 13.89% for EA H1N1, and 6.49%, 12.69%, 18.00%, 64.24%, 39.79%, 35.56% for pdm/09 H1N1, and 0.87%, 1.54%, 0, 0, 0, 0 for H3N2 SIV, during 2012 to 2017, respectively, while no H7N9 influenza virus antibody was detected. These results indicated that the infection with EA H1N1 and pdm/09 H1N1 subtypes of SIV were very common in Liaoning Province, and the EA H1N1 virus was the predominant subtype in large-scale pig farms during 2012 to 2014, while its positive rates significantly decreased to 1.46% in 2015 to 2016, with an increase to 13.89% in 2017. For the pdm/09 H1N1 virus, its positive rates has increased year by year from 2012 to 2015, and turned to be the predominant subtype in 2015 till 2017. In addition, there were certain geographical distribution difference in SIV prevalence situation between the five regions of Liaoning Province; the positive rates of SIV antibodies in eastern, southern and northern regions were higher than that in the western and central regions. In conclusion, EA H1N1 and pdm/09 H1N1 SIVs were widely prevalent in pig farms in Liaoning region, and H3N2 SIV were happened in pig farms in Liaoning western region, but its infection rate was very low with no detection since 2014.
兰德松, 魏澍, 侯振中. 2012-2017年辽宁省猪流感血清学调查分析[J]. 中国人兽共患病学报, 2019, 35(1): 91-95.
LAN De-song, WEI Su, HOU Zhen-zhong. Serological investigation and analysis of swine influenza in Liaoning, 2012-2017. Chinese Journal of Zoonoses, 2019, 35(1): 91-95.
