Streptococcus pyogenes A. is alpha-hemolytic. B. is gamma-hemolytic. C. is beta-hemolytic. D. may form endospores. E. is alpha-hemolytic AND may form endospores.

Is beta-hemolytic. (Ans. C)

Explanation:

Streptococcus pyogenes: It is a gram-positive bacteria, group of streptococcus. They are extracellular and they are composed of non-motile and non-sporing cocci. They cause a wide variety of disease in humans. It is the most common cause of acute pharyngitis.

Infection with Streptococcus pyogenes a beta-hemolytic bacterium that belongs to Lancefield serogroup A also called the group A streptococci (GAS). This bacteria mostly causing strep throat & bacterial sore throat.

Group A streptococci (GAS) when growing on blood agar they produce a small zone of beta-hemolysis, a full distraction of RBC (red blood cells). Then it is also called group A beta-hemolytic streptococcus.