The Southwest District Health Department said that the man lives in Canyon County, but may have been exposed in Adams County as well.
"The recent wet and increasing hot weather has created the flawless conditions for the Culex mosquito that carries West Nile Virus", Mark E. Wallace, Executive Director of the Weld County Health Department, stated in a press release. Test results later confirmed that West Nile virus was the culprit.
Fairfax County health officials said they've seen a "large increase" in mosquitoes carrying the virus.
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The number of confirmed infections can vary from year to year.
Several mosquito traps in Canyon County have tested positive for the virus this season, including one collected on July 20 in the Roswell Marsh area off Highway 18 near the Idaho-Oregon border.
The state is checking the case of an Allegheny County resident, sending samples to the Centers for Disease Control and Prevention.
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Even though the products are past their "best by" dates, the USDA is concerned that they may still be in people's refrigerators. The total number of laboratory-confirmed illnesses from that outbreak was at 286 as of July 26, according to the U.S.
Symptoms of West Nile Virus include fever, headache, body aches, nausea, vomiting, swollen lymph glands, a rash on the chest, stomach or back, and a fever.
Most people make a full recovery over weeks or months, officials said, but severe cases can lead to meningitis, paralysis and even death, according to experts.
Less than 1 percent of infected people develop the sometimes fatal neuro-invasive illness. People with weak immune systems or older than 60 are more at risk of the falling ill to the infection.
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Officials also recommend dumping out standing water that can collect in old tires, planters, buckets, toys, flowerpots, trash cans and birdbaths.