Gram-positive cocci in chains, beta-hemolytic, Lancefield group B. Identify the organism.

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Multiple Choice

Gram-positive cocci in chains, beta-hemolytic, Lancefield group B. Identify the organism.

This question centers on matching hemolysis pattern and Lancefield grouping to a Streptococcus species. Beta-hemolysis with a Lancefield group B antigen points to Streptococcus agalactiae, the Group B Streptococcus. This organism is a Gram-positive coccus that tends to appear in chains and is classically beta-hemolytic on blood agar. The other options don’t fit Group B: Streptococcus pyogenes is Group A and also beta-hemolytic, but not Group B; Streptococcus pneumoniae is typically alpha-hemolytic and appears as lancet-shaped diplococci; Streptococcus mitis is part of the viridans group and is usually alpha or nonhemolytic, not Group B.

This question centers on matching hemolysis pattern and Lancefield grouping to a Streptococcus species. Beta-hemolysis with a Lancefield group B antigen points to Streptococcus agalactiae, the Group B Streptococcus. This organism is a Gram-positive coccus that tends to appear in chains and is classically beta-hemolytic on blood agar. The other options don’t fit Group B: Streptococcus pyogenes is Group A and also beta-hemolytic, but not Group B; Streptococcus pneumoniae is typically alpha-hemolytic and appears as lancet-shaped diplococci; Streptococcus mitis is part of the viridans group and is usually alpha or nonhemolytic, not Group B.

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