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Disease Alerts

Updates on current disease outbreaks are listed here as they occur and will include the date listed, disease name, location and current status. Specific premises will not be named but the general location by town, county and state will be listed. When locations, events or horses are at risk they will be listed. Updates will be posted as they are received.



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New World Screwworm
Grant County, NM
Outbreak Identifier: 7682
Alert ID: 5257
September 18, 2026
Information Only

USDA-APHIS-Veterinary Services

Number Confirmed: 1; 
Comments: One confirmed case of New World Screwworm in New Mexico. The infested zone and surveillance zone are being established. For more information, please see the USDA NWS dashboard page https://www.aphis.usda.gov/animals/animal-health/livestock-and-poultry-disease/stop-screwworm/current-status/confirmed 

Additional information about NWS can be found at https://equinediseasecc.org/new-world-screwworm;
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New World Screwworm
Presidio County, TX
Outbreak Identifier: 7647
Alert ID: 5222
September 10, 2026
Information Only

USEF and USDA

Number Confirmed: 1; 
Facility Type: Farm;

Horse 1: 

Gender: Mare

Comment: This is the first case of New World Screwworm in a horse this century. The horse with the confirmed infestation of New World screwworm is a mare located in Presidio County, Texas. The infested wound is a long wound on the mare's hind quarter from an unknown source. Larvae were located in the deepest part of the wound, notable because it’s important that animal owners look closely at any wounds they suspect and collect maggots from all areas of the wound if required. The horse is not known to have moved onto or off of the premises within the tracing window. She is a horse that is used on the ranch.

For additional information, please see the USDA NWS dashboard page https://www.aphis.usda.gov/animals/animal-health/livestock-and-poultry-disease/stop-screwworm/current-status/confirmed. 

Additional information about NWS can be found at  https://equinediseasecc.org/new-world-screwworm
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