In addition, two other farms in Ibaraki also tested positive for antibodies of the virus. The news from Japan follows Russia's outbreak of bird flu. Top Russian veterinary officials are calling for international monetary aid to help fight the deadly virus.
While government officials have slaughtered more than 125,000 birds since the virus was first detected in Siberia, no human cases have been registered inside Russia.
Japanese officials have exterminated more than 300,000 chickens since the outbreak last year. Japan registered its first and only human case of bird flu last December.