Often when inoculating a BAP to observe hemoloysis patterns, investigators will also stab several times through the agar using an inoculating loop. This stab allows for the detection of streptolysin O ...

This is in contrast to Streptococcus species, whose growth is selected against by this high salt agar (plate on the right in the picture below). The differential ingredient in MSA is the sugar ...

On artificial cultivation these strains sooner or later assume the characteristics of streptococcus pyogenes. Cultures on blood agar plates from ordinary milk usually give rise to colonies of ...