In the most serious cases, West Nile virus can cause a form of potentially fatal meningitis.
West Nile virus is a mosquito-borne virus known to be present in Africa, Asia, Europe, and the Middle East - and, since 1999, the Americas as well.
Mosquitoes can be more than pesky insects.
To avoid mosquito bites, eliminate standing water areas where the bugs can breed.
The Health Department advised the city and the state to practice caution.
West Nile virus symptoms include fever, headache, stiffness, nausea and vomiting. "This mosquito activity is a warning that we will have a long season to prevent illness from the virus this year".
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"The findings from our mosquito surveillance and the early West Nile virus case serve as vital reminders that mosquito season is here and that all New Yorkers should take precautions to protect themselves and their families from mosquito bites", said Health Commissioner Dr. Mary T. Bassett.
Six mosquito samples collected in four Valley counties earlier this month tested positive for the West Nile virus, Cory Bower of the Northumberland County Conservation District said on Thursday. For more information on West Nile Virus, visit the Clark County Public Health website.
Kentucky confirmed 10 cases previous year, according to the CDC.
People older than 50 are at greater risk of developing severe neurologic disease from West Nile infection. Water in birdbaths, for example, should be refreshed at least once weekly, Beerman said.
Do not apply repellent near the eyes or mouth and use it sparingly around ears.
Wear shoes, socks, long trousers, and a long-sleeved shirt when outdoors for long periods of time, or when mosquitoes are more active. Don't spray repellents near food. Be sure to follow the instructions on the label.