Hong Kong University Center for Infectious Diseases Director he Bailiang says the past human cases of bird flu that have appeared on the mainland mostly belong to the H5 category.

香港大学感染及传染病中心总监何栢良表示，过去内地出现的人类感染禽流感类型，主要属于H 5类别。

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Since late 2003 the World Health Organisation (WHO) has confirmed at least 120 human cases of Avian 'bird' flu, all in Asia, and more than 60 confirmed human fatalities.

截至2003年末，世界卫生组织已经确诊至少120例人感染禽流感案例，这些案例均发生在亚洲，其中已导致60多人死亡。

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China reported three more cases of human infection of the H7N9 bird flu virus on Sunday, raising the total number of cases to 21 all in the eastern part of the country.

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But in the current issue of The New England Journal of Medicine, Thai doctors report two cases of apparent human-to human transmission of the bird flu.

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In other domestic news, the World Health Organization is watching out for mutations and possible human-to-human transmission of the new H7N9 bird flu strain after two family cluster cases - a father-and-son cluster and a husband-and-wife cluster - were detected in Shanghai, China Daily reports.

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