Journal
VETERINARY JOURNAL
Volume 187, Issue 2, Pages 200-206Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.tvjl.2009.10.026
Keywords
Influenza A virus; Pigs; Serology; Genetic analysis; H1N1; China
Categories
Funding
- National Science Fund for Distinguished Young Scholars [30725032]
- Natural Science for Major International Joint Research Project [30810103903]
- China's National Scientific and Technical Supporting Program [2006BAD06A02]
- China Special Grant for the Prevention and Control of Infection Diseases [2009ZX10004-204]
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A literature review and pooled data analysis were carried out to examine the prevalence of antibodies against five influenza virus subtypes in pigs in China over a 10-year period (1999-2009). The average seropositive frequencies of subtypes H1, H3, H5, H7 and H9 were 3478/11,168 (31.1%), 2900/10,139 (28.6%), 77/5945 (1.3%), 0/1440(0%) and 86/3619(2.4%), respectively. There was a geographical variation in the seroprevalence of subtype H1, with the highest seroprevalence in pigs in South and East China. BLAST analysis of genetic sequences revealed that genome segments with moderate homology to the 2009 pandemic influenza A (H1N1) virus were present among swine influenza viruses isolated in China, especially in South and East China. It was concluded from both serological and genetic studies that subtypes H1, H3, H5 and H9 are currently co-circulating in pigs in China, with the H1 subtype most commonly detected, followed by H3. (C) 2009 Elsevier Ltd. All rights reserved.
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