根据种痘法规定,为了保证我国人民有足够的抗天花免疫力,防止外袭性天花的侵入,实行每隔六年一次的复种制度。我市曾于1962、1969年进行普种,1972年又因邻近国家出现疫情,又进行大面积接种,在人群中建立了可靠的免疫屏障。但在每次进行数百万人次的种痘过程中,不仅需要大量人力物力,而且出现各类异常反应,总发生率约 According to the provisions of the vaccination law, in order to ensure that our people have enough anti-smallpox immunity and prevent the invading smallpox invade, the implementation of the multi-cropping system once every six years. In 1962, 1969, the city started to popularize. In 1972, due to the outbreak of epidemics in neighboring countries, large-scale inoculation was carried out and a reliable immune barrier was established in the population. However, every time millions of people vaccinated the process, not only requires a lot of manpower and resources, but also all kinds of abnormal reactions, the total incidence of about