Watson John T, Jones Roderick C, Gibbs Kevin, Paul William
Centers for Disease Control and Prevention, Atlanta, Georgia, USA.
Emerg Infect Dis. 2004 May;10(5):938-40. doi: 10.3201/eid1005.030603.
During the summer and fall of 2002, an epidemic (223 cases) and epizootic of West Nile virus infections occurred in Chicago. Retrospective spatial analysis demonstrated that age-adjusted human case rates were three times higher inside geographic areas with high early-season crow deaths than outside these areas.
2002年夏秋时节，芝加哥发生了西尼罗河病毒感染的疫情（223例）和动物疫情。回顾性空间分析表明，在早季乌鸦死亡数量较多的地理区域内，年龄调整后的人类病例率是这些区域外的三倍。
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