最近美国免疫实施咨询委员会全面评述了由Merck和Smith Kline两家公司研制的甲型肝炎疫苗的安全性和效力。美国食品与药物管理局(FDA)正考虑颁发生产许可证。Merck公司生产的甲型肝炎疫苗在2658人中进行了安全性和免疫原性试验,证实其在注射部位仅有轻微的局部反应而无明显的毒性副作用。在纽约的Monroe地区(肝炎高 The Advisory Committee on Immunization Practice recently reviewed the safety and efficacy of a Hepatitis A vaccine developed by both Merck and Smith Kline. The U.S. Food and Drug Administration (FDA) is considering issuing production licenses. The Hepatitis A vaccine produced by Merck performed safety and immunogenicity tests in 2658 people, confirming that it has only mild local reactions at the injection site without significant toxic side effects. In New York’s Monroe area (Hepatitis High