Novel Reassortant Influenza A(H1N2) Virus Derived from A(H1N1)pdm09 Virus Isolated from Swine, Japan, 2012
Miho Kobayashi, Ikuyo Takayama, Tsutomu Kageyama, Hiroyuki Tsukagoshi, Mika Saitoh, Taisei Ishioka, Yoko Yokota, Hirokazu Kimura, Masato Tashiro, and Kunihisa Kozawa
Author affiliations: Gunma Prefectural Institute of Public Health and Environmental Sciences, Maebashi-shi, Gunma, Japan (M. Kobayashi, H. Tsukagoshi, M. Saitoh, T. Ishioka, Y. Yokota, K. Kozawa); National Institute of Infectious Diseases, Musashimurayama-shi, Tokyo, Japan (I.Takayama, T. Kageyama, H. Kimura, M. Tashiro)
Figure. . Phylogenetic tree based on the nucleotide sequences of hemagglutinin (A) and neuraminidase (B) genes of A/swine/Gunma/1/2012, a novel H1N2 swine influenza virus (SIV) strain. Distance was calculated according to the Kimura 2-parameter method; the trees were constructed by using the neighbor-joining method with labeling of the branches showing at least 70% bootstrap support. Boldface text indicates the novel strain reassorted from strains of the SIV H1N2 subtype. Asterisks indicate reference strains compared with A/Swine/Gunma/1/2012 used to calculate the identity of neuraminidase gene. Scale bars indicate nucleotide substitutions per site.
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