[单项选择]

H₅N₁ avian influenza, known commonly as bird flu, has killed at least 15 people across Asia and was confirmed in China on January 27. No human cases have been found in the mainland, but 13 of the country’s 31 provinces, autonomous regions, and municipalities (直辖市) have reported the disease in poultry.
The Chinese government has taken measures to prevent and control the disease. Poultry: within 3 km of infected farms is to be killed and those within 5 km vaccinated (进行接种设苗). Meanwhile, there will be constant monitoring and daily reports on the disease across the country, and increased production of bird flu vaccines.
Among the Asian countries and regions affected by bird flu in animals, only Vietnam and Thailand have reported human cases. The people infected were reported to have caught the disease from poultry. While the World Health Organization (WHO) said there is "no proof of human-to-human transmission (传播)" of bird
A. infected poultry within 3 km was killed in China
B. bird flu case was confirmed in China on Jan. 27
C. human infected cases were found in 11 Asian countries
D. over two thirds of China have been effected by the bird fin

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