捷克疫苗接种和旅游医学中心Beran等将116名16～45岁的健康研究对象随机分为两组,均用AventisPasteur公司生产的传统甲型肝炎疫苗进行首次免疫,168天(6个月)后,一组继续用该疫苗免疫,另一组则使用伤寒-甲型肝炎联合疫苗免疫(采用双腔针筒,在注入人体前即刻混合)。观察两组免疫 Beran et al., The Czech Center for Vaccination and Tourism Medicine, randomized 116 healthy subjects aged 16-45 years to first immunization with a conventional hepatitis A vaccine from Aventis Pasteur. After 168 days (six months) One group continued to be immunized with the vaccine, while the other group was immunized with a combination typhoid-hepatitis A vaccine (using a dual-lumen syringe that was mixed immediately before injection into the human body). Two groups of immunization were observed