Development of a real-time PCR to detect Streptococcus equi subspecies equi.

Summary

# Editorial Summary: Real-time PCR for *Streptococcus equi* Detection Strangles remains endemic across UK equestrian populations, with persistent carriers serving as silent reservoirs of infection—yet identifying these chronically infected horses has proven diagnostically challenging because conventional culture yields poor sensitivity and is readily obscured by contaminating flora. North and colleagues developed and validated a real-time PCR assay specifically targeting *Streptococcus equi* subspecies *equi*, addressing the longstanding problem of reliably differentiating this pathogen from the closely related *S. equi* zooepidemicus. The technique offers superior sensitivity compared to standard bacterial culture, particularly valuable for detecting the low-level shedding characteristic of carrier animals and for screening horses before introduction to establishments. For practitioners managing strangles cases or implementing biosecurity protocols, this molecular approach provides a more accurate diagnostic pathway than culture alone—enabling targeted identification of carrier horses that would otherwise escape detection and continue to pose transmission risk to susceptible populations.

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Key Findings

• •Real-time PCR was developed to detect S. equi subspecies equi with improved sensitivity over standard culture techniques
• •The assay enables differentiation of S. equi from the closely related S. equi zooepidemicus
• •The diagnostic test addresses the challenge of identifying persistently infected carrier horses that act as infection reservoirs

Conditions Studied

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