1979年12月至1980年元月,银川地区一些厂矿、机关、学校、农场等地有流感流行,经病原学、血清学及流行病学调查,证实了本次流行是由甲_3型流感病毒引起的,现报道如下.材料和方法1.对本次流行的主要单位进行了流行病学的现场调查,并采集疑似流感现症患者的 From December 1979 to January 1980, some factories and mines, institutions, schools, farms and other places in Yinchuan were endemic. Influenza, serology and epidemiological investigations confirmed that the epidemic was caused by influenza A-3 Viruses, are reported below. Materials and methods 1. Conducted an epidemiological on-site survey of the major units of this epidemic and the acquisition of suspected influenza patients