[文献资料]参 考 文 献

1 . http ： / / www . who . int/csr/sars/country/table2004 _ 04 _ 21 / en / .Risk factors for severe illness with 2009 pandemic influenza A （ H1N1 ） virus infection in China . Clin Infect Dis ， 2011 ， 52.Person-to-person asymptomatic infection of severe fe ......