Symptoms associated with West Nile virus typically appear 3 to 14 days after infection.
The first human case of West Nile Virus in the province this year has been found in a child.
Despite the low numbers of nuisance mosquitoes this summer, the numbers of infected Culex tarsalis continue to increase.
Symptoms of the viral disease vary from person to person, the CDC noted. "Of the mosquito-borne diseases, West Nile virus is the most common one in the continental United States".
Urban areas are more likely to have mosquitoes that carry WNV.
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The most vulnerable to the virus are people age 50 and older and those who have weakened immune systems because of diseases such as diabetes and cancer. About one in five will develop flu-like symptoms that can include fever, headache, body aches, joint pains, vomiting, diarrhea or rash.
Human and non-human cases of West Nile Virus by state. Of those, 23 cases involved meningitis or encephalitis.
Since mosquitoes are attracted to standing water, residents are also advised to clean or empty out items that may hold water such as old tires, buckets, planters, toys, birdbaths, flowerpots, tarps, trash containers, downspout extensions and other containers to stop mosquitoes from breeding on your property.
Dr. Benjamin Schwartz, director of epidemiology and population health with the Fairfax County Health Department said people should use mosquito repellent that contains DEET, picaridin, R3535 or oil of lemon eucalyptus; wear long trousers and long sleeves, and avoid areas where mosquitoes are common, particularly during dawn and dusk. Drain any standing water in your yard each week. The use of mosquito nets can be useful at night, particularly for infants.