18/08/2026
West Nile virus season started early in Utah this year and we expect it to last through the fall. So far this year, 7 Utahns have tested positive for West Nile virus. The first one was diagnosed at the end of June, which is much earlier than we normally see human cases of West Nile virus.
West Nile virus is spread to people through the bite of an infected mosquito. Anyone can become infected. Most people infected with West Nile virus do not feel sick. Some people develop a fever and other flu-like symptoms. A small percentage (fewer than 1%) of people infected develop severe illness that affects the central nervous system. People who are 65 or older, have a weakened immune system, or have certain medical conditions like diabetes are at higher risk for severe illness.
If you notice flu-like symptoms this time of year, including high fever, severe headache, or stiff neck, especially after being bitten by a mosquito, see a healthcare provider. They can test you for West Nile virus. Tell your doctor if you are on a B cell-depleting medication since you will need a special test to be diagnosed.
There are no vaccines or medications to prevent or treat WNV in people. You can reduce your risk for WNV by using insect repellent and wearing long-sleeved shirts and long pants to prevent mosquito bites. 🦟
