4Wiebenga N H,Chang W K,French G R,et al,Epi-demic disease in Hong Kong,1968,associated with an antigenic variant of Asian influenza virus[J].Am J Public Health Nations Health,1970,60(9):1806-1812.
5Shanta M.Zimer,Donald S.Burke,2009 Historical Perspective-Emergence of influenza A(H1N1)Viruses[J].The New England Journal of Medicine,2009,(16):361:363.
6Taubenberger J K,Morens D,1918 Influenza:the mother of all pandemics[J].Emergency Infection Disease,2006.12(1):15-22.
7WHO.Influenza A (H1N1)-update 46[EB/OL].http://www.who.int.2009-06-10.
1Cockburn W C, Delon P J, Ferreira W. Origin and progress of the 1968-69 Hong Kong influenza epidemic [J]. Bull World Health Organ, 1969, 41:345-348.
2Longini I M Jr, Fine P E, Thacker S B. Predicting the global spread of new infectious agents [J].Am J Epidemiol, 1986, 123: 383-391.
3Schulman J L, Kilbourne E D. Independent variation in nature of the hemagglutinin and neuraminidase antigens of influenza virus: distinctiveness of the hemagglutinin antigen of Hong Kong-68 virus [J].Proc Natl Acad Sci U S A, 1969, 63. 326-333.
4Stuart-Harris C. Epidemiology of influenza in man [J]. Br Med Bull, 1979, 35: 3-8.
5Monto A S, Kendal A P. Effect of neuraminidase antibody on Hong Kong influenza [J]. Lancet, 1973, 1: 623-625.
6Viboud C, Grais R F, Lafont B A, et al. Multinational impact of the 1968 Hong Kong pan demic, evidence for a smoldering pandemic [J].J Infect Dis, 2005, 192: 223-248.
7Miller D L, Pereira M S, Clarke M. Epidemiology of the Hong Kong 68 variant of influenza A2 in Britain[J]. Br Med J, 1971, 1: 475- 479.
8Stuart-Harris C H. Pandemic influenza.- an unresolved problem in prevention [J]. J Infect Dis, 1970, 122: 108-115.
9Noble G R. Epidemiological and clinical aspects of influenza. In basic and applied influenza research [M]. ed. AS Beare, Boca Raton,FL: CRC. 1982: 11-50.
10Stephen E L, Nancy J C, Alexander K. Evolutionary analysis of human H2N2 and early H3N diver H2N influenza viruses., evidence for genetic ence and multiple reassortment among and/or H3N2 viruses [J]. Int Congr,2004, 1263: 184-190.
