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迄今为止,虽然在控制传染病方面取得了进展,但是在所有发展中国家,尤其在五岁以下年龄组中,传染病仍引起高的发病率和死亡率。环境管理、媒介的控制和普遍改善生活条件无疑会降低传染病的威胁,但这种进程是缓慢的,且需大量投资,这在许多发展中国家是难以进行的。疫苗是预防传染病诸多办法中有效的工具,天花的消灭已清楚地显示了这一点。近几年来,在生物学医学方面令人注目的进展
To date, although progress has been made in the control of infectious diseases, infectious diseases continue to cause high morbidity and mortality in all developing countries, especially in the under-five age group. Environmental management, media control and generally improving living conditions undoubtedly reduce the threat of infectious diseases, but such processes are slow and require substantial investment, making it difficult for many developing countries. Vaccines are an effective tool in many ways of preventing infectious diseases, and the elimination of smallpox has clearly shown this. In recent years, remarkable progress has been made in biological medicine