|West Nile Virus
West Nile is a pretty benign illness in kids. The most common symptoms in kids, if there are any, are a little fever and some muscle aches, possibly diarrhea and vomiting.
The scarier stuff from news reports, involving encephalitis and death, has been in older people and has not been reported in children. West Nile in kids is hard to tell from any other virus, goes away by itself and sometimes has no symptoms at all.