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Beta-hemolytic colonies of Streptococcus equi ssp. equi on sheep blood agar. Mucoid colonies, encapsulated strain. Cultivation 24 hours in an aerobic
atmosphere, 37°C.
The bacterium, Streptococcus equi ssp. equi, is what causes the disease in equine species (horses, donkeys, mules) called strangles. It got its name because historically, affected horses were sometimes suffocated from inflamed lymph nodes in their upper airway and trachea. It is a highly contagious disease that is transmitted directly by contact with infected horses or indirectly by contact with water troughs, feed buckets, pastures, stalls, trailers, tack, grooming equipment, etc.
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