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流行性乙型脑炎是夏秋季节散在性发生的,以蚊虫为媒介的中枢神经系统传染病,主要侵犯儿童,病原体是病毒。近年来各地对这种病的流行病学、病原学、临床观察等,已有许多报道,并且取得很大成绩。现综合各地的经验和个人的一些体会,分述于下。有关流行病学方面的几个特点及预防措施本病特点之一是具有严格季节性,一般以7、8、9三个月发病的多。本病的发生与自然因素包括温度、湿度、雨量,有密切关系。据报告达种病毒在蚊体内繁殖活动,必须有22～24℃以上的温度。这是形成严格季节性的原因。本病的特点之二是有隐性感染。据调查流行地区健康成年人80%以上血清中有中和达种病毒的抗体,说明过去曾受感染,但未出现临床症状或症状极轻而未引起注意。隐性感染的机制,目前虽然还不清楚,但从实验室资料看来,推测可能有两种因素:一种是自然界中存在有弱病毒株,被此种病毒感染后,病毒停留在血液内,不侵犯神经组织,但产生抗体;另一种是病毒侵入人体后存留在血液中,只有在血脑屏障不健全时
Epidemic encephalitis is a sexually transmitted disease that occurs in summer and autumn. The mosquito is a central nervous system infectious disease that affects children and the pathogen is a virus. In recent years, the epidemiology, etiology and clinical observation of this disease have been reported everywhere and many achievements have been made. Now based on the experience of all parts of the experience and some individuals, points out in the next. On the epidemiological aspects of several features and preventive measures One of the characteristics of this disease is strictly seasonal, usually 7,8,9 three months of onset and more. The occurrence of this disease and natural factors, including temperature, humidity, rainfall, are closely related. It is reported that in order to propagate virus in mosquito breeding activity, there must be a temperature above 22 ~ 24 ℃. This is the reason for the strict seasonal. The second characteristic of this disease is latent infection. Antibodies that neutralize up to 80% of the serum in healthy adults surveyed in endemic areas indicate that they have been previously infected but did not show any clinical signs or symptoms and did not attract attention. Implicit infection mechanism, although it is not clear, but from the laboratory data, it is speculated that there may be two factors: one is the existence of a weak virus in nature, is infected with the virus, the virus stays in the blood , Does not infringe on nerve tissue, but produce antibodies; the other is the virus invades the human body after remaining in the blood, only when the blood-brain barrier is not perfect