Although cooler temperatures have arrived in many parts of the country, the number of equine West Nile virus (WNV) and Eastern equine encephalitis (EEE) cases still continues to rise.

At their most recent update on Oct. 30, the USDA Animal and Plant Health Inspection Service (APHIS) reported that 566 cases of equine WNV had been confirmed nationwide since the start of the year; in that same time span, 195 EEE cases had been diagnosed. As of Nov. 6, the United States Geological Survey (USGS) disease maps indicated that the WNV and EEE totals had risen to 620 and 204, respectively.

At most recent update, the USGS reported that Texas (100 cases), Louisiana (62 cases), Pennsylvania (50 cases), and California (45 cases) have tallied the most WNV cases this year. Louisiana (56 cases), Mississippi (31 cases), and Florida (29 cases) have reported the most EEE cases, also according to the USGS.

Another mosquito-borne disease, Western equine encephalitis, has not been identified in the United States this year

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