Disease Alerts

Number Suspected: Unknown; 
Number Exposed: Unknown; 
Number Euthanized: 1; 
Comments: The infected horse was euthanized on 07/16/2026, but the other horses at the facility will remain under quarantine until a sixty day retest is conducted and they are found negative per WSDA and USDA program requirements.; 
Previous Alerts: 5061

Number Confirmed: 2; 
Number Suspected: Unknown; 
Number Exposed: 16; 
Number Euthanized: 2; 
Facility Type: Private Facility; 
Comments: This was an epidemiological link to an EIA infected premises in Pierce County (previous EDCC alert 5048). Eighteen (18) horses at the location were tested for EIA and Piroplasmosis by state animal health officials. Two (2) horses at the location were reported positive for EIA on 7/17/2026 from NVSL. The positive horses have been euthanized, but the quarantine will remain in place until a sixty day retest is conducted and they are found negative per WSDA and USDA program requirements.;

Number Confirmed: 1; 
Number Exposed: Unknown; 

Horse 1: 
Age: 5; Gender: Mare; Breed: Quarter Horse (QH); Clinical Signs: Lethargy, fever; Confirmation Date: 7/7/2026; Horse Status: Affected And Alive; Vaccination Status: Unvaccinated;

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

Number Confirmed: 1; 
Facility Type: Private Facility; 
Comments: Not vaccinated;

Number Confirmed: 1; 
Number Exposed: 4; 
Number Euthanized: 1; 
Facility Type: Private Facility; 
Comments: This quarter horse had confirmed history with unsanctioned racing. This is the first case of EIA for Florida in 2026.;

Number Confirmed: 1; 
Number Exposed: Unknown; 
Number Euthanized: 1; 
Facility Type: Private Facility; 
Comments: This is the third confirmed case of EEE for Florida in 2026.;

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

Horse 1: 
Age: 24; Gender: Mare; Breed: Thoroughbred (TB); Onset of Clinical Signs: 7/7/2026; Clinical Signs: This mare developed acute ataxia in all four limbs with muscle fasciculations and hyperesthesia on July 7. Clinical signs progressed and she was euthanized. Nasal swab and blood samples were positive for EHV-1 by PCR. There was no history of recent travel.; Horse Status: Euthanized; 

Comments: The facility owner, working with their veterinarian, has instituted voluntary animal movement restrictions and biosecurity protocols. To see past and present EHV-1 neurologic (EHM) cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal;

Comments: Since the last VSV situation report (7/1/2026), two (2) new VSV-presumptive positive equine premises have been quarantined in Rio Arriba County, New Mexico. All confirmed cases in the 2025-26 outbreak have been vesicular stomatitis New Jersey virus (VSNJV) serotype. Updates are as follows: Colorado • A VSV-affected equine premises remains quarantined in Montrose County, Colorado- New Mexico • Rio Arriba County – 2 new presumptive positive equine premises have been quarantined • Since the last situation report (7/1/2026), 3 previously VSV-affected premises have been released from quarantine in Rio Arriba (1) and Valencia (2) counties. Since the start of the outbreak, 32 VSV-affected premises have been identified (25 confirmed positive, 7 presumptive positive) in 3 states, Arizona, Colorado, and New Mexico. All 32 premises have had only equine species clinically affected with 15 premises located in 6 Arizona counties (Cochise, Gila, Maricopa, Pinal, Santa Cruz, and Yavapai Counties), 2 premises located in 2 Colorado counties (Montezuma and Montrose Counties), and 15 premises located in 4 New Mexico counties (Rio Arriba, Sandoval, Santa Fe, and Valencia Counties).;

Number Confirmed: 1; 
Number Exposed: Unknown; 

Horse 1: 
Age: 13; Gender: Mare; Breed: Quarter Horse (QH); Onset of Clinical Signs: 6/22/2026; Clinical Signs: Nasal discharge and discharge from lymph nodes; Confirmation Date: 7/2/2026; Horse Status: Recovering; Vaccination Status: Status Unknown;