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 Massachusett

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