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Updated: Dec 14 2016

Introduction to Streptococcus

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  • Introduction
    • There are 6 classic Gram-positive groups of bacteria that cause disease in humans
      • 2 are cocci
        • one of these is streptococcus
        • the other is staphylococcus
    • Streptococci vs staphylococcus
      • on Gram stain, strep looks like a "strip" of bacteria, while staph looks like a cluster
      • strep is catalase negative, staph is catalase positive
    • Lancefield antigens
      • strep are characterized by the antigenic properties of the C carbohydrate in the cell wall
      • so-called Lancefield antigens are given letter names (A, B, C, D, etc. through S)
      • S. pneumoniae and viridans group streptococci do not have Lancefield antigens
    • Significant human streptococci pathogens
      • S. pyogenes (group A)
      • S. agalacticae (group B)
      • S. bovis (group D)
      • enterococci (group D)
      • S. pneumoniae
      • viridans group streptococci
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