West Nile virus cases rise across U.S., with deaths reported in Arizona and California
The CDC reports more than 180 West Nile virus infections this year, including eight fatalities in 30 states, as drought conditions may be contributing to increased transmission.
The United States has seen a rise in West Nile virus infections this year, with the Centers for Disease Control and Prevention recording over 180 cases and eight deaths across 30 states. Arizona leads with 73 confirmed cases and five fatalities, while California has reported three deaths among 30 patients.
Idaho documented its first severe case in a 65-year-old resident, prompting state epidemiologist Dr. Christine Hahn to urge protective measures against mosquito bites. "The report of the first severe West Nile virus disease of the season in an Idaho resident is a good reminder for all of us to take protective measures against mosquito bites," she said.
The virus, transmitted primarily through mosquito bites, can cause severe neurological symptoms such as high fever, coma, tremors, vision loss, paralysis and inflammation of the brain and spinal cord. While most infections are mild, individuals with weakened immune systems are at higher risk of fatal outcomes.
Experts note that drought conditions in the western United States may be facilitating virus spread by concentrating mosquitoes and birds around limited water sources. "Drought conditions can increase West Nile virus transmission because it concentrates mosquitoes and birds around shrinking water sources, increasing transmission risk," said Matthew Aliota, a virology professor at the University of Minnesota.
Mosquito populations remain lower than average in some northern states, but health officials recommend standard preventive actions nationwide, including the use of insect repellent, wearing protective clothing and eliminating standing water around homes.