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Published online ahead of print on 4 March 2009 as doi:10.1099/vir.0.007617-0
Journal of General Virology 2009;90:827.

A more recent version of this article appeared on April 1, 2009 J Gen Virol (2009), DOI 10.1099/vir.0.007617-0
© 2009 Society for General Microbiology
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Evidence of frequent introductions of Japanese encephalitis virus from Southeast Asia and Continental East Asia to Japan

Takeshi Nabeshima1, Hyunh Thi Kim Loan2, Shingo Inoue1, Makoto Sumiyoshi1, Yasuhiro Haruta1, Phan Thi Nga2, Vu Thi Que Huoung2, Maria del Carmen Parquet1, Futoshi Hasebe1 and Kouichi Morita1,3

1 Institute of Tropical Medicine, Nagasaki University;
2 National Institute of Hygiene and Epidemiology, Vietnam, Hanoi

3 E-mail: moritak{at}net.nagasaki-u.ac.jp

The Japanese encephalitis virus (JEV) circulating in Japan consists of viruses with multiple phylogenetic origins. Phylogenetic analysis revealed that some JEV strains have recently migrated from Southeast and Continental East Asian countries. One phylogenetic subcluster of the JEV strains circulating in Japan was closely related to viruses isolated in Vietnam and China's inland region while some other JEV subclusters were related to viruses isolated in Shanghai, China. One virus subcluster, however, was isolated solely in Japan and was not found in any other Asian country. Therefore, our data suggests that the JEVs that have remained or are circulating in Japan include a mixture of viruses that have previously migrated from Southeast and Continental East Asian countries.

Received 29 September 2008; accepted 15 December 2008.




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