Those efforts will reduce the likelihood of outbreaks. If we do see them, they will be smaller. Back to top. People are infected by mosquitoes that acquire the virus when they feed on infected birds. Virus activity is most likely in late summer or early fall.
Most cases are mild.
People older than 50 or those who are immunocompromised are at greatest risk of severe disease. Fever, headache and body aches, often with skin rash and swollen lymph glands. More severe infections may be marked by headache, high fever, neck stiffness, stupor, disorientation, coma, tremors, convulsions, muscle weakness, paralysis and death. No specific therapy. In more severe cases, intensive supportive therapy is indicated.