Mosquitoes found in Gem County carry rare St. Louis virus

Mosquitoes trapped in two locations by the Gem County Mosquito Abatement District tested positive for St. Louis encephalitis virus.

Both areas are being treated, but efforts are being hampered by weather.

It’s unusual to find the virus in Idaho. According the Center for Disease Control, most cases have occurred in eastern and central states. Most people infected with SLEV show no symptoms. Those who do become ill experience flu-like symptoms — fever, headache, nausea, vomiting, and fatigue.

The more severe version of the disease involves inflammation of the brain, and occurs most commonly in older adults. Cases involving death or long-term disability are extremely rare.

To reduce your risk of being infected use insect repellent, wear protective clothing, stay indoors while mosquitoes are active, make sure window screens are secure and eliminate standing water on your property.

This story was originally published September 18, 2017 at 8:51 PM with the headline "Mosquitoes found in Gem County carry rare St. Louis virus."