病毒在自然界广泛存在,据现有资料表明,人类传染病中约75%由病毒引起,95%急性上呼吸道疾病和大部分下呼吸道疾病由细菌以外的感染原引起,其中以病毒感染最为常见,因此对其研究及防治甚为重要。但当前对大多数病毒感染的治疗尚无特效方法,故预防为其关键。预防原则:①自动免疫最为理想。大多数人在患过某种传染病或 Viruses are widespread in nature. According to available data, about 75% of human infectious diseases are caused by viruses, 95% of acute upper respiratory diseases and most of lower respiratory diseases are caused by infectious agents other than bacteria, of which virus infection is the most common, Therefore, its research and prevention is very important. However, at present there is no effective method for the treatment of most virus infections, so prevention is the key. Prevention principles: ① automatic immunization is the best. Most people are suffering from some kind of infectious disease or