Mesa County sees first West Nile virus case

Mesa County has its first case this year of West Nile virus in an adult, the county’s Health Department reported today.

The department said the incubation period for the virus is five to seven days, and it usually takes that long for symptoms to appear.

This past week, however, mosquito sampling have shown none testing positive for the virus, though the department said rain and windy weather can affect test results. As a result, the department couldn’t say where the adult was infected.

The department began seeing mosquitoes testing positive for the virus in early June, a month sooner than usual. By mid-July, about half of the mosquito samples collected by the department tested positive for the virus.

Of people infected with the virus, 80 percent show no symptoms. Symptoms can include headache, fever, body aches, nausea, a rash and swollen lymph nodes. Severe illness such as meningitis and encephalitis can occur.



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