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We conducted nationwide West Nile virus (WNV) surveillance targeting mosquitoes and dead birds to reveal whether the virus and its potential vectors are present in Japan. A total of 12 766 mosquitoes and 230 dead birds were collected in April 2004–March 2005 (the 2004–2005 period), 10 755 mosquitoes and 267 dead birds in April 2005–March 2006 (the 2005–2006 period), and 8624 mosquitoes and 245 dead...
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