Strangles Prevention and Biosecurity in Horse Communities

Strangles (Streptococcus equi) causes significant suffering and economic loss, and effective biosecurity measures prevent outbreaks in horse populations.

Key Facts

Strangles affects upper respiratory tract with abscess formation in submandibular and retropharyngeal lymph nodes
Approximately 10% of recovered horses become persistent carriers shedding bacteria without clinical signs
PCR guttural pouch lavage identifies carrier horses that are the primary source of herd outbreaks
Vaccination reduces disease severity but does not prevent infection in vaccinated horses
Quarantine of new arrivals for minimum 3 weeks reduces outbreak risk substantially
Bastard strangles (internal abscess formation) causes severe illness with poor prognosis
Purpura hemorrhagica is an immune-mediated complication causing vasculitis after strangles infection

Welfare Considerations

Strangles causes significant acute suffering - affected horses are febrile, anorexic, and experience painful lymph node abscessation and dysphagia. Complications including bastard strangles and purpura hemorrhagica cause severe, potentially fatal disease. Outbreaks cause substantial distress across entire yards. Prevention through appropriate biosecurity is far more humane than managing outbreaks. Carrier horse identification enables targeted control rather than blanket restriction. The welfare imperative is clear: quarantine new arrivals, test horses with uncertain history, and vaccinate in high-risk environments.

What You Can Do

Quarantine all new arrivals for minimum 3 weeks with no horse-to-horse contact
Test horses with uncertain strangles history using guttural pouch lavage PCR before mixing with resident horses
Vaccinate yard horses annually if exposure risk is high (competition yards, livery yards)
Implement strict hygiene when horses have been at shows or events before returning to the yard
Report any suspected strangles outbreak to your vet promptly to enable early containment
Test recovered horses for carrier status before returning to normal yard contact
Maintain strangles biosecurity protocols as standard practice rather than only during outbreaks