6WHO. Hepatitis A vaccines [J] .WER, 2000, 75: 37-44.
7Demicheli V, Tiberti D. The effectiveness and safety of hepatitis A vac- cine: a systematic review [J] .Vaccine, 2003, 21 (19-20): 2 242 - 2 245.
8Taraz Samandari, Beth P. Bell, Gregory L, eta/. Quantifying the im- pact of hepatitis A immunization, in the United States, 1995 -2001[J] . Vaccine, 2004, 22 (31 -32) : 4 342 -4 350.
9Clemens R, Safary A, Hepburn A, et al. Clinical experience with an inactivated hepatitis A vaccine [ J] .J Infect Dis, 1995, 171 ( Suppl 1 ) : s44 - 49.