[unable to retrieve full-text content]Getting infected with West Nile virus, transmitted by mosquitoes, is believed to confer lifelong immunity, but the effect may dwindle over the years, researchers say.
Source: http://www.nytimes.com/2012/09/25/science/can-you-get-west-nile-virus-more-than-once.html?partner=rss&emc=rss
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