Big cities like Yonkers and leafy villages like Scarsdale are scheduled to be sprayed for mosquitoes this week because two cases of St. Louis encephalitis have been detected in residents of southern Westchester County.
The Centers for Disease Control and Prevention reported Monday that laboratory tests had confirmed the disease in a Yonkers man in his 70s and a Mount Vernon man in his 50s. A third case, involving a 57-year-old Port Chester woman, is considered highly probable.
All three victims were exposed to the disease last month and already are recovering, said Dr. Harold Adel, county health commissioner. Their exposure came during a New York City outbreak, which has killed three senior citizens and infected nine others since late August.
A second round of spraying is under way in the city. Mayor Rudolph Giuliani said the first application killed 90 percent of the mosquitoes in the city.
Westchester, which has been testing dozens of patients for possible encephalitis, had resisted spraying until confirmed cases were found. Its tests of trapped mosquitoes found none to be carrying the virus, and officials acknowledged that residents who had the disease could have contracted it elsewhere.