High counts of West Nile virus cases are being reported in the U.S. this year, according to federal health data — and health officials are warning the season for this mosquito-borne disease isn’t over yet.
As of Sept. 9, at least 771 human cases across 39 states have been reported, according to data posted by the Centers for Disease Control and Prevention this week. Of these cases, 490 are neuroinvasive, meaning they are severe cases impacting the brain.
West Nile virus is the leading cause of mosquito-borne disease in the continental U.S. While it primarily infects people during mosquito season in the summer and fall, experts have warned a warming climate means mosquito season is getting longer, prompting greater potential for the spread of disease.
After Massachusetts recently announced two additional human cases, the state’s public health commissioner Dr. Robbie Goldstein encouraged the public to stay vigilant.
“Infections can continue to occur until the first hard frost of the season, which is likely still many weeks away,” Goldstein said in a news release. “We are encouraging everyone to continue to take the necessary steps to protect themselves from mosquito bites, including by using mosquito repellent, wearing long sleeves and pants to reduce exposed skin, and to drain anything that may be collecting water outside your home.”
The CBS News data team is tracking confirmed West Nile cases nationwide as new data is released by ArboNET, a national arboviral surveillance system managed by CDC and state health departments. (The map below is updated bi-weekly on Tuesdays when the latest data is released.)
