Conclusion The H2 strain vaccine has a very good protective efficacy, and obviously decreases the attack rate, new infection rate and clinical cases by HAV infection.

• 结论H2株甲肝减毒活疫苗保护效果明显，减少了发病、新感染和显性病例，但少数免疫人群仍可被感染，以隐性感染为主。