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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