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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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San Mateo County, CA
Outbreak Identifier: 5069
Alert ID: 2410
February 09, 2022
Outbreak Update

California Department of Food and Agriculture

Number Confirmed: 13;
Number Suspected: 5;
Number Exposed: 300;
Facility Type: Boarding Facility;
Age: 10; Gender: Gelding; Breed: Quarter Horse (QH); Onset of Clinical Signs: 2/5/2022;
Clinical Signs: Fever; Confirmation Date: 2/7/2022; Horse Status: Affected And Alive; Vaccination Status: Vaccinated;
Age: 20; Gender: Mare; Breed: Warmblood (WB); Onset of Clinical Signs: 2/4/2022;
Clinical Signs: Fever; Confirmation Date: 2/8/2022; Horse Status: Affected And Alive; Vaccination Status: Status Unknown;
Age: 11; Gender: Gelding; Breed: Warmblood (WB); Onset of Clinical Signs: 2/1/2022;
Clinical Signs: Fever, sheath edema; Confirmation Date: 2/8/2022; Horse Status: Affected And Alive; Vaccination Status: Vaccinated;
Notes: Update 2/08/2022; Original alerts 2405, 2406, 2408:  February 8, 2022: Two additional horses from the index premises, an 11-year-old Warmblood gelding and a 20-year-old Warmblood mare, displaying fever only with no neurological signs were confirmed positive for EHV-1 on February 8th, and have been isolated at the index premises. To date, two (2) EHM cases (EHV-1 positive with neurologic signs) and eleven (11) EHV-1 febrile only cases have been confirmed. February 7, 2022: One additional horse from the index premises, a 10-year-old Quarter Horse gelding displaying fever with no neurological signs on February 5th was confirmed positive for EHV-1 on February 7th and has been isolated at the index premises.;