Three of the 21 dead birds that recently washed up on Hong Kong's shores tested positive for the deadly strain of bird flu, the government said Wednesday.
Hong Kong health officials were investigating Wednesday whether 21 dead birds that recently washed up on the territory's beaches came from mainland China, where five people have died of bird flu this year.
Public health officials have expressed concern over a possible surge in influenza cases due to flu virus mutations as people return to work and schools reopen next week.
Some 220 million doses of Tamiflu, the vaccine against bird flu, are in the hands of governments worldwide, the Swiss pharmaceutical giant Roche said Wednesday.
Experts in Hong Kong were carrying out tests Tuesday on dead birds washed up on beaches amid fears of a large unreported avian-flu outbreak in neighboring mainland China.
Vietnam's capital city Hanoi has banned the use of motorcycles and bicycles to transport live poultry as part of efforts to protect the city from a bird flu outbreak.
The public should maintain high alert against the influenza virus after the massive flow of travelers during and in the wake of the long Chinese New Year holidays, according to public health officials.
Researchers in Japan said Thursday they had developed a flu vaccine that works against multiple viruses and could prevent a deadly pandemic of bird flu mutations.
A man in the southwestern Chinese province of Guizhou has been infected with bird flu and is in a critical condition in hospital, the Health Ministry said on Sunday.
Tests have confirmed an outbreak of bird flu at a turkey farm near Vancouver, but it appeared to be a less virulent strain and posed little risk to humans, officials said on Saturday.