Eighty percent of infections are thought to be asymptomatic. A very, very small percentage of infections, somewhere like 1 to 2 percent, may result in serious disease.
The suite of mosquitoes we have in this urban environment aren't really terrific vectors of [eastern equine encephalitis]. If we do have human cases of it, typically it's from people who have imported it from elsewhere.
The risk factors for coming down with a serious case of West Nile virus aren't too different from any other illness, with the immunocompromised and elderly particularly at risk.
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