The Streptococcus anginosus group (S. milleri group) is a term for a large group of streptococci, including Streptococcus intermedius, Streptococcus constellatus, and Streptococcus anginosus. Usually considered commensals, these organisms are often associated with various pyogenic infections, including cardiac, intra-abdominal, subcutaneous, and central nervous system infections, particularly with the formation of purulent abscesses. Epidural and subdural abscesses are clinical manifestations rare for the S. anginosus group (S. milleri group).
Treatment
Organisms of the
Streptococcus anginosus group (
S. milleri group) are often unrecognized pathogens due to the lack of uniformity in classifications and difficulties in microbiological identification. Penicillin G, cephalosporins, clindamycin, and vancomycin all possess activity against these streptococci. Using agents with poor activity may promote infections with the
Streptococcus anginosus group
(
S. milleri group) and allow it to exhibit its pathogenicity. An understanding of these organisms may aid in their recognition and proper treatment.
