Streptococcus ferus

Streptococcus ferus is a facultatively anaerobic, gram-positive species of the Streptococcus genus. The species is a member of the Viridans streptococci group which are a large mixed-group of mostly alpha-hemolytic streptococci. The alpha-hemolytic bacteria are ones that exhibit a partial hemolysis with green coloration when grown on sheep blood agar (see image.)