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给幼儿进行预防接种是一种主动免疫的方法。我国现推行的预防接种是为了预防下列六种传染病;结核病、百日咳、破伤风、白喉、灰髓炎(又称小儿麻痹症)及麻疹。有的地区还把乙型脑炎、流行性脑膜炎、乙型肝炎列为预防接种的内容。目前,世界上平均每六分钟就有一个儿童死于可以通过预防接种来预防的疾病,有一个儿童因患这类病而致残。每年有五百万儿童死于上述六种疾病。一九八五年全世界儿童接受预防接种的人数比一九八三年增加了三
Vaccination of young children is a method of active immunization. Vaccination is now being implemented in our country to prevent the following six infectious diseases; tuberculosis, whooping cough, tetanus, diphtheria, keloiditis (also known as poliomyelitis) and measles. In some areas, Japanese encephalitis, meningitis and hepatitis B are listed as vaccinations. At present, on average every six minutes in the world, one child dies of a disease that can be prevented by vaccination, and one child is disabled by the disease. Every year, five million children die of the six diseases mentioned above. In 1985, the number of children vaccinated around the world increased by three over 1983