Zweighaft R M, Rasmussen C, Brolnitsky O, Lashof J C
Am J Trop Med Hyg. 1979 Jan;28(1):114-8. doi: 10.4269/ajtmh.1979.28.114.
The largest laboratory-documented outbreak of St. Louis encephalitis (SLE) in the United States occurred in the Chicago metropolitan area in the summer and early fall of 1975. Of 1,456 illnesses investigated, 326 cases of confirmed or probable SLE and 420 cases of suspected SLE were found in the six-county area. The outbreak peaked in early September, but cases continued to occur through October. Cases clustered geographically in the southwestern suburbs. There was a direct correlation between age and attack rate, severity of illness, and mortality rate--all of which increased with successive age groups. Thirty-six persons died. Males and females were equally affected. This epidemic marked the first time that St. Louis encephalitis has been documented in the Chicago area.
美国有记录以来规模最大的一次实验室确诊的圣路易斯脑炎（SLE）疫情于1975年夏秋之际在芝加哥大都市地区爆发。在调查的1456例病例中，该六县地区发现了326例确诊或疑似SLE病例以及420例疑似SLE病例。疫情在9月初达到高峰，但病例一直持续出现到10月。病例在西南郊区呈地理聚集性。年龄与发病率、疾病严重程度和死亡率之间存在直接关联——所有这些都随着年龄组的递增而上升。36人死亡。男性和女性受影响程度相同。这次疫情标志着芝加哥地区首次有圣路易斯脑炎的记录。
