今年入春以来,流行性感冒、流行性脑脊髓膜炎及麻疹在全国各地有广泛的流行。这可能是由于病菌病毒毒力增强,人的易感性增高,以及交通繁密有助于传播的原故。北京市从三月份以来到现在已有二百多个集体单位(工厂、学校、企业)先后发生流行性感冒流行;甘肃省境内玉门油矿由于流行性感冒流行,出勤率受到严重影响,在兰州 Since the beginning of this spring, influenza, meningococcal meningitis and measles have become widespread in various parts of the country. This may be due to the increased virulence of germs and viruses, the increased susceptibility of human beings, and the fact that the heavy traffic helps to spread the disease. Since March, Beijing has had more than 200 collective units (factories, schools and enterprises) having epidemics since then. In Yumen Oil Mine in Gansu Province, due to the prevalence of influenza, the attendance rate has been seriously affected. In Lanzhou