Question

All of the following pertain to Streptococcus pyogenes except ________.

a. secretes streptokinase
b. causes gas gangrene
c. is often from an endogenous source
d. causes impetigo
e. coats itself with host proteins

Answer 1

Streptococcus pyogenes does not cause gas gangrene; this condition is typically caused by the bacterium Clostridium perfringens.

Step-by-step explanation:

All of the following pertain to Streptococcus pyogenes except causes gas gangrene. Streptococcus pyogenes, often referred to as group A streptococcus (GAS), is known to secrete various extracellular enzymes such as streptolysins, hyaluronidase, and streptokinase. These contribute to the pathogen's virulence and ability to cause multiple infections, such as bacterial pharyngitis (strep throat) and skin infections like impetigo as well as more severe conditions such as necrotizing fasciitis. It is also characterized by its ability to coat itself with host proteins to avoid phagocytosis. However, gas gangrene is typically caused by a different bacterium, Clostridium perfringens, and not by Streptococcus pyogenes.