Clindamycin in the treatment of group G beta-haemolytic streptococcal infections.

We report a case of severe streptococcal cellulitis in a healthy 47 year old male, where the sole microbial isolate was a beta-haemolytic group G Streptococcus. Treatment failure with high dose penicillin was observed despite in vitro sensitivity. The addition of clindamycin resulted in dramatic clinical improvement. This may indicate an Eagle-type effect (whereby antibiotics exhibit paradoxically reduced bactericidal activities at high drug concentrations), in group G beta-haemolytic infections. Although well documented with group A streptococcal infections, this phenomenon has not been fully recognised with group G beta-haemolytic streptococcal infections. This may have important implications for clinical management.