West Nile fever heads north.
Weir
E
E
D002170:Canada / Q000453:epidemiology; D006801:Humans; D009032:Mosquito Control; D009519:New York City / Q000453:epidemiology; D014901:West Nile Fever / Q000453:epidemiology* / Q000517:prevention & control / Q000635:transmission; D014902:West Nile virus / Q000502:physiology