2Zhong NS, Zheng BJ, Li YM, et al. Epidemiology and cause of severe acute respiratory syndrome (SARS) in guangdong, People's Republic of China, in February, 2003 [ J ]. Lancet, 2003,362 ( 25 ): 1353 - 1358.
3Richard J, Webby, Robert G, et al. Are we ready for pandemic influenza[J]? Science,2003,302:1519- 1522.
4Li KS, Xu KM, Peiris M, et al. Characterization of H9 subtyre influenza viruses from the duck of seuthem china: candidate for the next influenza pandemic in humans [ J ]? Virol, 2003, 77 ( 12 ):6988 - 6994.
