The reports included a detailed review of the safety of smallpoxvaccine based on historical data as well as recent experience, particularly in the United States.
这两份报告包括了一份详尽的，主要以美国的历史资料和近期经验为依据的有关天花疫苗安全性的综述。
2
The Committee further noted that if the vaccine is being used in mass campaigns, it would be especially important for smallpox immunization programmes to be supported by adverse event monitoring.
委员会进一步指出，如果疫苗用于群体免疫，特别重要的是要有不良反应事件监测系统来支持天花免疫规划。
3
Also, the vaccines against polio are not as effective as the smallpoxvaccine, which was so powerful that a single vaccination protected almost everyone.