West Nile infected mosquitoes have been discovered in three different Louisville zip code areas.
The positive test came from one of the Haldimand-Norfolk Health Unit's mosquito traps in Simcoe.
Officials said recent heavy rains are creating conditions for the spread of West Nile.
West Nile virus is spread by the bite of an infected mosquito.
The person, who was hospitalized and is now recovering, is an adult resident of the northeastern part of the county, the county health department said in a news release.
Human and non-human cases of West Nile Virus by state. Our goal is for that to be the only one.
Use DEET-enhanced insect repellent or alternatives.
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Maryland's Department of Agriculture said it found the virus in mosquitoes collected in the Riverdale Park area of Prince George's County. Keep in mind to drain water from tires, cans, flowerpots, clogged rain gutters, rain barrels, toys and puddles. The pool of water that collects in a single upturned bottle cap can incubate hundreds of eggs. Manitobans are urged to protect themselves by staying indoors during dusk and dawn, using mosquito repellent, and wearing white, long-sleeved shirts and trousers instead of shorts.
DRESS in long sleeves and trousers in areas where mosquitoes are active.
Helwig and Carroll said the wet, hot weather is driving the increase in West Nile. Standing water is an ideal breeding ground for mosquitoes. Mosquitoes become infected when they feed on infected birds. The natural hosts of the virus are birds.
Female mosquitoes eat one "blood meal" and then lay 300 eggs, a process that they can go through up to four times. Anyone who thinks they may be infected should see a doctor immediately, officials said.
The symptoms of more severe cases include disorientation, coma, tremors, vision loss and numbness.
In a very few cases, West Nile fever leads to encephalitis or meningitis with associated neck stiffness, confusion, or seizures.