Which organism is the causative agent of scarlet fever?

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Multiple Choice

Which organism is the causative agent of scarlet fever?

Scarlet fever is caused by infection with group A Streptococcus, specifically Streptococcus pyogenes. These bacteria produce pyrogenic (erythrogenic) toxins that trigger the characteristic diffuse red rash and fever, often following a strep throat or skin infection. The organism is a gram-positive coccus in chains and is beta-hemolytic on blood agar, categorized as Lancefield group A. Other organisms listed are responsible for different diseases: Staphylococcus aureus causes toxin-mediated conditions like toxic shock and bullous impetigo, while Streptococcus pneumoniae and Neisseria meningitidis cause pneumonia, meningitis, and septicemia. Thus, the correct agent for scarlet fever is Streptococcus pyogenes.

Scarlet fever is caused by infection with group A Streptococcus, specifically Streptococcus pyogenes. These bacteria produce pyrogenic (erythrogenic) toxins that trigger the characteristic diffuse red rash and fever, often following a strep throat or skin infection. The organism is a gram-positive coccus in chains and is beta-hemolytic on blood agar, categorized as Lancefield group A. Other organisms listed are responsible for different diseases: Staphylococcus aureus causes toxin-mediated conditions like toxic shock and bullous impetigo, while Streptococcus pneumoniae and Neisseria meningitidis cause pneumonia, meningitis, and septicemia. Thus, the correct agent for scarlet fever is Streptococcus pyogenes.

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