Bacteriology Lecture 3: Streptococci Characteristics
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Questions and Answers

What kind of media is required for the growth of Streptococcaceae family members?

  • Media enriched with salt and water
  • Media enriched with sulfur and phosphorus
  • Media enriched with glucose and starch
  • Media enriched with blood, serum, or ascitic fluid (correct)
  • Which classification system divides streptococci into obligate anaerobes and aerobes or facultative anaerobes?

  • Serological classification
  • Cultural character-based classification (correct)
  • Molecular classification
  • Morphological classification
  • What are streptococci classified as based on their hemolytic property on blood agar plates?

  • Obligate aerobes
  • Aerobic or facultative anaerobic streptococci (correct)
  • Gram-negative rods
  • Facultative anaerobes
  • Why is morphological classification of streptococci not considered satisfactory?

    <p>Length of chain depends on the medium and several other factors</p> Signup and view all the answers

    How are long-chain streptococci typically classified?

    <p>Pathogenic strain</p> Signup and view all the answers

    Study Notes

    General Characters of Streptococci

    • Belong to the Streptococcaceae family
    • Gram-positive cocci arranged in chains
    • Non-motile and non-sporing

    Growth Requirements

    • Fastidious microorganisms
    • Require media enriched with:
      • Blood
      • Serum
      • Ascitic fluid for growth

    Classification of Streptococcus

    Morphological Classification

    • Classified into:
      • Long chain (pathogenic strain)
      • Short chain (non-pathogenic)
    • Not a satisfactory method due to:
      • Chain length dependent on growth medium
      • Other factors influencing chain length

    Classification based on Cultural Characteristics

    • Divided into:
      • Obligate anaerobes (Peptostreptococci)
      • Aerobes or facultative anaerobes
    • Aerobic or facultative streptococci further classified based on:
      • Hemolytic property on blood agar plate

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    Description

    This lecture covers the general characteristics and classification of Streptococcus, a type of Gram-positive cocci. It includes their growth requirements and different systems of classification.

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