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Health experts have been most worried about the possibility of the disease combining with the human influenza virus to create a more lethal version that could be spread between people ? giving rise to a global pandemic.
China's Agriculture Ministry reported bird flu in three more provinces on Saturday.
The WHO was investigating Cambodia's first suspected human case ? a woman who fell ill in Takeo province and died in a hospital in neighboring Vietnam, said Sean Tobin, a WHO medical epidemiologist in the capital, Phnom Penh.
Singapore has also stopped U.S. poultry imports, the Agri-Food and Veterinary Authority said in a statement.
More than 50 million chickens have been slaughtered in Asia to stem the spread of the virus.
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