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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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Montgomery County, MD
Outbreak Identifier: 7477
Alert ID: 5045
June 20, 2026
Confirmed Case(s) - Official Quarantine

University Clinician and State Veterinarian

Number Confirmed: 1; 
Number Suspected: 3; 
Number Exposed: Unknown; 
Facility Type: Boarding Facility; 

Horse 1: 
Age: 18; Gender: Mare; Breed: Paint; Onset of Clinical Signs: 6/14/2026; Clinical Signs: The mare was referred to an equine hospital for evaluation and treatment of fever, diarrhea, and systemic inflammatory response syndrome. She was admitted under isolation protocol, and has improved with treatment. Fecal samples collected at hospital admission were positive on PCR and culture for Salmonella. Several other horses on the farm have been treated for fever, diarrhea, and/or colic in the last week.; Confirmation Date: 6/18/2026; Horse Status: Affected And Alive;