NPR's Joanne Silberner looks at the closure of New York's Central Park, after a report that West Nile virus was isolated from mosquitoes there. Public health officials said they closed the park and initiated spraying for mosquitoes even though the risk of getting the virus was small. People who have immune system disorders or who are elderly may get a brain infection from West Nile virus. Last year, seven elderly New Yorkers died as a result of the infection.
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