Qi X, Pang B, Lu CP.. Genetic characterization of H1N1 swine influenza A viruses isolated in eastern China. Virus Genes. 2009 Jun 12
Three influenza H1N1 viruses were isolated in 2005 from pigs with respiratory disease on a farm in eastern China. The three isolates were characterized to determine their probable origin. Each of the eight genes of the isolates was most closely related to the corresponding gene from the classical swine H1N1 virus. Also, phylogenetic analysis further confirmed that each of the eight genes of the isolates was closely related to the classical swine H1N1 viruses, especially those isolated in China. The HA1 proteins of the three isolates were identical to that of A/Swine/Guangdong/1/01, a virus isolated in 2001 in China, even though three nucleotide differences were observed. These results further support the concept that swine can serve as a reservoir of genetically stable influenza viruses.
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