Streptococci

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• Haemolytic streptococci of Lancefield group C are common inhabitants of the equine nasopharynx
• Streptococcus zooepidemicus and S. equisimilis are usually non-pathogenic
• S. equi is more pathogenic and is the cause of strangles with rhinitis, pharyngitis, lymphadenitis

URT inflammation in horses

• peritonitis in pigs

• S. zooepidemicus can cause similar signs to strangles in horses

• May cause sinusitis in horses