ABPath Medical Microbiology Practice Questions - ABPath Medical Microbiology Subspecialty Certification Examination Exam

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A pleural fluid specimen shows Gram-positive cocci in chains on direct smear. After 24 hours on sheep blood agar, colonies are small with a narrow zone of beta-hemolysis and are catalase-negative. Lancefield grouping is positive for Group A. Which organism is most likely?

Streptococcus pyogenes Streptococcus agalactiae Enterococcus faecalis Streptococcus pneumoniae

Correct Answer:

Streptococcus pyogenes

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