At least 100 Israelis infected with West Nile virus, most patients concentrated in central Israel
For the most part, the virus is considered a mild disease, but in some cases, it causes severe morbidity and even death.
Aedes aegypti mosquitos are seen in a lab at the Fiocruz institute on January 26, 2016 in Recife, Pernambuco state, Brazil.(photo credit: Mario Tama/Getty Images)