Federal health officials said Wednesday that the West Nile outbreak in the United States that has killed 41 people and infected more than 1,100 is shaping up to be the worst ever in the U.S. since the virus first appeared on the continent 13 years ago. Last week, Dallas declared a state of emergency after 10 people died and 111 were infected. Deaths from West Nile, which is carried by mosquitoes, have been concentrated in Texas, Louisiana, Mississippi, Oklahoma, and South Dakota. Because symptoms of the virus take days to weeks to appear, the Centers for Disease Control and Prevention expect the number of infections reported to keep increasing through the end of September.
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