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石河子地区某团场从1971年至1974年连续四年每年均发生一次麻疹流行。其发病率分别为148.7‰、23.6‰、27.5‰和70.2‰。麻疹病例数占传染病总病例数的比重大,流行范围广,全团场35个基层单位每年均有1/3到2/3的单位发生流行。2～5月份为季节高峰,每次流行后均有二个月以上的间歇期,远超过麻疹的最长潜伏期。说明本单位无麻疹传染源的持续存在。调查说明每年流行均由外地传入。都是易感儿随家长回内地探亲受传染后把麻疹带入本单位的。加之未做好前例传染源的检疫隔离工作而造成流行。调查提
In Shihezi area, a measles epidemic occurred every year for four consecutive years from 1971 to 1974. The incidence rates were 148.7 ‰, 23.6 ‰, 27.5 ‰ and 70.2 ‰, respectively. The number of cases of measles accounts for a large proportion of the total number of cases of infectious diseases, with a wide range of epidemic. 35 grassroots units in the entire league are prevalent in 1/3 to 2/3 units each year. February to May is the peak season, each time after the epidemic have more than two months of intermittent period, far exceeding the longest incubation period of measles. Indicating that the unit is no source of measles infection persists. Survey shows that the annual epidemic are imported from the field. Are susceptible children with parents to visit relatives in the Mainland infected with measles brought into this unit. In addition, the quarantine and isolation work of the former source of infection did not make the epidemic. Survey mentioned