It's probably faster to list where the West Nile virus isn't than where it is. The mosquito-borne malady has nearly circled the globe since its 1937 discovery in Africa. North America is one of its latest conquests.
Leona Thrower felt exhausted, but she blamed it on recent travel. Then came the nausea. Four days later, the 67-year-old lay comatose in intensive care, battling encephalitis caused by West Nile virus.