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The worst West Nile outbreak in the U.S. to date came in 2002. That year in Illinois alone, there were 884 cases across the state, and 67 deaths, with 42 of them in Cook County. More from CBS News ...
The latest report comes after mosquitoes with West Nile Virus were also found in the north suburbs late last month. The insects were collected in Glenview, Illinois health officials said.