Overview

• As of Sept. 9, federal data show 771 U.S. cases with 490 classified as neuroinvasive, running roughly 40% above typical levels for this point in the year.
• Health officials warn the risk will persist until the first hard frost, urging EPA-registered repellents, long sleeves and removing standing water.
• CDC officials say deaths appear on pace to be higher this year, though mortality figures remain preliminary and no specifics were released.
• Experts attribute the rise to a greater share of mosquitoes carrying the virus rather than higher overall mosquito numbers, influenced by weather and local control efforts.
• Colorado has reported about 150 cases and Fort Collins monitoring found 35 infected mosquitoes per 1,000 versus an expected 8, while Suffolk County, N.Y., confirmed two additional cases for a total of three.