Disease Alerts

Number Confirmed: 1; 
Number Exposed: Unknown; 
Number Euthanized: 1; 
Facility Type: Private Facility; 

Horse 1: 
Age: 1; Gender: Gelding; Breed: Warmblood (WB); Onset of Clinical Signs: 3/15/2026; Clinical Signs: Acute onset head tilt with all limb weakness progressing to lateral recumbency; Confirmation Date: 3/26/2026; Horse Status: Euthanized; Vaccination Status: Status Unknown;

Comments: This is the first confirmed EEE case for Florida in 2026.;

Number Confirmed: 1; 
Number Exposed: 3; 

Horse 1: 
Age: 4; Gender: Gelding; Breed: Quarter Horse (QH); Horse Status: Euthanized; 

Comments: A 4–year–old Appendix Quarter Horse gelding in Fresno County was confirmed positive for Equine Infectious Anemia (EIA). The horse was euthanized on March 27, 2026, due to worsening clinical signs. Three (3) potentially exposed horses on the home premises have initially tested negative for EIA and will remain under quarantine until their sixty (60) day retest as per CDFA and USDA program requirements. CDFA has been on site with continued monitoring of the situation. Epidemiological tracing determined that the positive horse had recently trained on the same premises as the current Stanislaus County EIA incident. Related to previous alert ID: 4938.;

Number Confirmed: 1; 

Horse 1: 
Age: 3; Gender: Gelding; Breed: Quarter Horse (QH); Confirmation Date: 4/9/2026; 

Comments: A 3–year–old Quarter Horse gelding in San Joaquin County was confirmed positive for Equine Infectious Anemia (EIA). Epidemiological tracing determined that this horse had recently trained on the same premises as the current Stanislaus County EIA incident. The gelding has been quarantined on premises with no additional exposed horses on the property. Related to previous alert ID: 4938.;

Number Confirmed: 1; 
Number Suspected: Unknown; 
Number Exposed: 10;

Number Suspected: 12; 
Number Exposed: Unknown; 
Facility Type: Private Facility;

Clinical signs: Nasal discharge, swollen and draining lymph lodes, fever, lethargy, depression, some with difficulty breathing as a result of swelling. 

Number Confirmed: 1; 
Number Suspected: 1; 
Number Exposed: 2; 
Facility Type: Private Facility;

Comments: Since the last situation report (3/4/2026), there have been two (2) new confirmed VSV-positive equine premises identified in Arizona (Yavapai County). All confirmed cases in the 2025-26 outbreak have been vesicular stomatitis New Jersey virus (VSNJV) serotype. Updates are as follows: Arizona • Yavapai County – 2 new equine premises confirmed VSV-positive on 4/6/2026 • Since the last situation report (3/4/2026), four (4) previously VSV-affected premises have been released from quarantine in Gila (1), Maricopa (1), and Yavapai (2) Counties. Classification of Cases Premises that have diagnostic laboratory confirmation of VSV are categorized as confirmed positive premises. Once a county is confirmed as VSV-positive, new equine premises presenting with clinical signs of VSV in that county are not required to be tested for confirmation of the disease, but the premises will be quarantined and classified as a presumptive positive premises. Premises may also be classified as presumptive positive if clinical animals on the premises fail to meet confirmed case definition, but there is diagnostic laboratory evidence of recent VSV infection. For more info go to: https://www.aphis.usda.gov/sites/default/files/vsv-sitrep-4-7-26.pdf;

Number Confirmed: 2; 
Number Suspected: Unknown; 
Number Exposed: 35; 
Facility Type: Boarding Facility; 
Comments: Additional case confirmed; 
Previous Alerts: 4935

Number Confirmed: 1; 
Number Suspected: 1; 
Number Exposed: 1; 
Facility Type: Private Facility; 

Horse 1: 
Age: 2; Gender: Filly; Breed: Miniature Horse; Usage: Companion; Onset of Clinical Signs: 3/16/2026; Clinical Signs: Cough, nasal discharge; Confirmation Date: 4/3/2026; Horse Status: Recovering; Vaccination Status: Unvaccinated;

Number Confirmed: 15; 
Number Exposed: 12; 
Number Euthanized: 15; 
Comments: Thirteen (13) additional horses on the home premises tested positive for EIA. Euthanasia was elected by owners for these cases and was witnessed by CDFA veterinarians on March 24, 2026 and April 7, 2026. The remaining twelve (12) exposed horses will remain under quarantine until their sixty (60) day retest.;