Genetic characterization of swine influenza viruses isolated in Japan between 2009 and 2012
Article first published online: 23 OCT 2012
© 2012 The Societies and Wiley Publishing Asia Pty Ltd
Microbiology and Immunology
Volume 56, Issue 11, pages 792–803, November 2012
How to Cite
Matsuu, A., Uchida, Y., Takemae, N., Mawatari, T., Kasai Yoneyama, S., Kasai, T., Nakamura, R., Eto, M. and Saito, T. (2012), Genetic characterization of swine influenza viruses isolated in Japan between 2009 and 2012. Microbiology and Immunology, 56: 792–803. doi: 10.1111/j.1348-0421.2012.00501.x
- Issue published online: 23 OCT 2012
- Article first published online: 23 OCT 2012
- Accepted manuscript online: 25 AUG 2012 02:38AM EST
- Received 21 May 2012; revised 23 July 2012; accepted 31 July 2012.
- A(H1N1)pdm virus;
- swine influenza virus
Eleven swine influenza viruses (SIVs) isolated from pigs in Japanese institutions between 2009 and 2012 were genetically characterized. Seven H1N1 were shown to have originated from A(H1N1)pdm09 viruses. Two H1N2 viruses contained H1 and N2 genes of Japanese H1N2 SIV origin together with internal genes of A(H1N1)pdm09 viruses. Two H3N2 viruses isolated during animal quarantine were identified as triple reassortant H3N2 viruses maintained among pigs in North America. This study shows that A(H1N1)pdm09 viruses and their reassortant strains are already present in domestic pigs in Japan and that novel SIVs are possibly being imported from abroad.