Despite the fact that summer is over and fall has arrived, horses around the country continue testing positive for both Eastern equine encephalitis (EEE) and West Nile virus (WNV), according to recent updates to the U.S. Department of Agriculture Animal and Plant Health Inspection Service disease maps. Still, the number of confirmed cases of these mosquito-borne diseases remains below last year’s totals.

As of Sept. 25, 21 states had reported 139 cases of EEE in horses. South Carolina and Florida have seen the most cases so far—36 and 28, respectively—with Georgia (20) and North Carolina (12) following behind. EEE cases have also been confirmed in Alabama (4), Arkansas (3), Connecticut (1), Delaware (1), Kentucky (1), Louisiana (6), Maine (3), Maryland (1), Massachusetts (4), Michigan (1), Mississippi (9), New Hampshire (1), New Jersey (3), New York (1), Texas (1), Vermont (2), and Virginia (1).

Last year, 209 cases of EEE were reported in horses nationwide, with Louisiana (55), Florida (34) and Mississippi (32) confirming the most cases.

Also as of Sept. 25, 157 cases of equine WNV had been reported in 28 states. Montana and Wyoming reported 17 and 11 cases, respectively, while Texas and California reported nine and eight cases each. Cases have also been reported in Arkansas (1), Colorado (3), Delaware (1), Florida (2), Georgia (2), Idaho (4), Illinois (2), Indiana (1), Iowa (5), Kentucky (2), Louisiana (2), Michigan (2), Minnesota (2), Mississippi (1), Missouri (3), Nebraska (3), New Mexico (3), New York (2), Ohio (1), Oklahoma (5), South Carolina (1), South Dakota (2), Utah (4), and Vermont (1)

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