Eight of the confirmed infections were in northeast Queens, and one in southern Brooklyn. One additional case is suspected but has not yet been classified by officials. In Westchester County, health officials say there are six suspected cases of encephalitis. Nassau County also has reported six suspected cases of the diseases. Symptoms of St. Louis encephalitis include fever, headache, and lethargy.
Severe cases can cause seizure and paralysis.
Blood samples from possible cases are sent to the Centers for Disease Control laboratory in Fort Collins, Colo., for analysis. The tests can take up to 48 hours. City health officials say the pesticide, malathion, is safe, but they are urging those living in areas being sprayed to remain indoors for two to three hours after the spraying. He said those sensitive to pesticides may experience eye irritation, rash, or respiratory problems. The city has established a public information hot line.