Mosquitos carrying the West Nile virus have been discovered in stagnant bodies of water in Box Elder and Uintah counties, though there are still no cases reported in Utah.
But officials from the Utah Department of Health are urging people to keep their guard up during the holiday weekend.
"There is no vaccine for humans. So, taking simple precautions to avoid mosquito bites is the key to reducing your risk for infection," UDOH epidemiologist JoDee Baker said in a statement.
The virus spreads through the bite of an infected mosquito, though not all of the insects have West Nile. The bugs are most active from dusk until dawn.