It's a virus that can spread to humans through bites from infected mosquitos.
The confirmed human case in Duval County comes after officials issued a mosquito-borne illness advisory following confirmation of several sentinel chicken flocks that tested positive for the virus infection.
According to the B.C. Centre for Disease Control, the vast majority of people who contract West Nile will never show symptoms, but the disease is still serious for one in every 150 people infected. People 60 and older are more susceptible to these severe symptoms.
To reduce risk of exposure to the virus, Utahns should use repellent, wear long sleeves and trousers after dusk, remove standing water outside their homes, clean their gutters and keep grass and weeds trimmed short, health officials advised. Ensure that doors and windows have tight, properly fitting screens.
Mosquitoes are most active at duck and dawn, so take extra protection during those times- wearing long sleeves and trousers if possible. Mosquitoes lay their larvae in standing water.
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-Repel: Use Environmental Protection Agency (EPA)-approved insect repellents when outdoors, such as those containing the active ingredient DEET.
There are ways to limit mosquito population near your property. Empty any unused flowerpots and wading pools, and change the water in birdbaths frequently. You should wear loose-fitting and long-sleeved clothing.
Be sure to apply mosquito repellent to bare skin. Unused swimming pools should be drained and kept dry during the mosquito season.
State Epidemiologist at the Massachusetts Department of Public Health, Dr. Catherine Brown, explains how they conduct mosquito testing.
More information, including all WNV and EEE positive results, can be found on the Arbovirus Surveillance Information web page at www.mass.gov/dph/mosquito or by calling the DPH Epidemiology Program at 617-983-6800.