Presence of avian pneumovirus subtypes A and B in Japan.

@article{Mase2003PresenceOA,
  title={Presence of avian pneumovirus subtypes A and B in Japan.},
  author={Masaji Mase and Shigeo Yamaguchi and Kenji Tsukamoto and Tadao Imada and Kunitoshi Imai and Kikuyasu Nakamura},
  journal={Avian diseases},
  year={2003},
  volume={47 2},
  pages={481-4}
}
Four avian pneumovirus (APV) isolates from chickens clinically diagnosed with swollen head syndrome were genetically characterized as to the subtypes of the virus in Japan. The results of reverse transcriptase-polymerase chain reactions based on subtype-specific primers and direct sequence analysis of G genes indicated subtypes A and B but not C or D of APV were present in Japan. Several routes or sources are conceivable for APV to invade into Japan. 

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