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23 August, 06:36

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.

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  1. 23 August, 08:21
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    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.
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