. Introduction
Streptococcus anginosus group (SAG) bacteria, formerly referred
to as the Streptococcus milleri group, consists of three distinct
streptococcus species [1]: S. anginosus, Streptococcus constellatus,
and Streptococcus intermedius. SAG bacteria, classified as viridans
streptococci, have clinically distinct characteristics from other viridians
streptococci in that they cause pyogenic infections in
various parts of the body [2]. Bacteremia caused by this group is
associated with infections that require surgical treatment [3]. To
date, few studies have examined the clinical importance of SAG
bacteremia, and most of these studies were conducted before 2000
[4e8]. To investigate the characteristics of SAG bacteremia in recent
years, we conducted this retrospective cohort study and compared
its findings with the data from previous studies.