Strangles: a pathogenic legacy of the war horse.
Authors: Waller Andrew S
Journal: The Veterinary record
Summary
# Editorial Summary: Strangles—A Pathogenic Legacy of the War Horse Streptococcus equi has plagued horses for nearly eight centuries, yet despite over 100 years of focused research, strangles remains the single most common infectious disease in equine practice, with the UK alone experiencing more than 600 outbreaks annually. Waller's review examines recent evolutionary insights into S. equi, exploring how understanding the pathogen's origins and adaptation may inform more effective outbreak prevention and management strategies. The historical perspective—tracing the disease from its first medical description in 1251 through to modern molecular characterisation—reveals why conventional control measures have struggled against this remarkably persistent infection. By contextualising strangles within the organism's evolutionary trajectory and epidemiological behaviour, the review highlights critical gaps between current practice and what molecular evidence suggests about transmission, carrier states, and pathogenesis. For practitioners managing strangles cases, this work underscores the importance of aligning clinical protocols with contemporary understanding of S. equi's biology, particularly regarding isolation protocols, diagnostic timing, and the management of chronic carriers that perpetuate recurrent outbreaks.
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Practical Takeaways
- •Strangles remains highly prevalent in UK horse populations despite centuries of recognition and >100 years of research; staying current on outbreak protocols is essential for all equine practitioners
- •Understanding the evolutionary history of S. equi is critical for implementing effective biosecurity and outbreak management strategies on farms and in practice
- •This review synthesizes recent advances in pathogen understanding that should inform contemporary approaches to prevention and treatment protocols
Key Findings
- •Strangles remains the most frequently diagnosed infection in horses with over 600 outbreaks identified annually in the UK alone
- •Streptococcus equi was identified as the causative agent in 1888, over a century ago, yet disease prevalence persists
- •The disease has been documented since at least 1251, indicating a historical and ongoing pathogenic burden
- •Recent advances in understanding S. equi evolution are providing new insights into outbreak prevention and resolution