Lancefield Classification Quiz
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Questions and Answers

Which method can be used to extract the C carbohydrate from the streptococcal cell wall according to Rebecca Lancefield's findings?

  • Heating the organisms in the presence of oxygen
  • Placing organisms in a hypertonic solution
  • Boiling the organisms in water
  • Placing organisms in dilute acid and heating (correct)

    • What is the main function of M Protein in Streptococcus pyogenes?

  • Resisting phagocytosis (correct)
  • Promoting phagocytosis
  • Activating complement pathways
  • Stimulating antibody production

    • What is the role of Lipoteichoic Acid in Streptococcus pyogenes?

  • Adhesion to epithelial cells (correct)
  • Preventing recognition by antibodies
  • Promoting phagocytosis
  • Deactivating M Protein for virulence

    • Which Streptococcal strain is known to have over 200 serotypes?

    <p>Streptococcus pyogenes</p> Signup and view all the answers

    Which molecule helps prevent recognition of Streptococcus pyogenes by masking antigens?

    <p>Hyaluronic Acid Capsule</p> Signup and view all the answers

    What is the significance of M1 in Streptococcus pyogenes infections?

    <p>Resisting phagocytosis</p> Signup and view all the answers

    What is the difference between Streptolysin O and Streptolysin S?

    <p>Streptolysin O causes hemolysis without oxygen and is immunogenic, while Streptolysin S causes hemolysis with oxygen and is non-immunogenic.</p> Signup and view all the answers

    What is the most common type of Deoxyribonuclease (DNase) produced by Streptococcus pyogenes?

    <p>DNase B</p> Signup and view all the answers

    Which of the following is NOT a characteristic of erysipelas caused by Streptococcus pyogenes?

    <p>Seen in adults</p> Signup and view all the answers

    What is the role of Streptokinase produced by Streptococcus pyogenes?

    <p>It causes lysis of fibrin clots.</p> Signup and view all the answers

    Which of the following is NOT an Erythrogenic Exotoxin produced by Streptococcus pyogenes?

    <p>SpeD</p> Signup and view all the answers

    What is the most common manifestation of Streptococcus pyogenes infection?

    <p>Bacterial pharyngitis</p> Signup and view all the answers

    Which streptolysin is immunogenic but destroyed by skin fat?

    <p>Streptolysin O</p> Signup and view all the answers

    Which infection involves rapid progression of inflammation and necrosis known as 'galloping gangrene'?

    <p>Necrotizing Fasciitis</p> Signup and view all the answers

    Which Streptococcal infection leads to a life-threatening Toxic Shock Syndrome similar to Staphylococcal TSS?

    <p>Streptococcal Toxic Shock Syndrome</p> Signup and view all the answers

    What is the main symptom of Acute Glomerulonephritis that distinguishes it from other conditions?

    <p>Proteinuria</p> Signup and view all the answers

    What is the main factor causing Rheumatic Fever?

    <p>Antigenic Cross Reactivity with heart tissue</p> Signup and view all the answers

    Why is Gram stain of little value in microscopy for the mentioned infections?

    <p>Cells are resistant to drying</p> Signup and view all the answers

    What is the most common cause of pneumonia in 2-year-olds?

    <p>Pneumonia</p> Signup and view all the answers

    Which of the following is a characteristic of the $eta$-hemolytic pattern for Group B Streptococcus?

    <p>Bacitracin resistant</p> Signup and view all the answers

    What is the recommended method for detecting Group B Streptococcus in pregnant women?

    <p>Check for the presence of Group B antigen in the vagina</p> Signup and view all the answers

    What is the primary drug of choice for treating Group B Streptococcus infections?

    <p>Penicillin</p> Signup and view all the answers

    Which of the following is a virulence factor for Group B Streptococcus?

    <p>Capsule that prevents phagocytosis</p> Signup and view all the answers

    What is the recommended method for confirming the identity of Streptococcus pneumoniae?

    <p>Capsular swelling test</p> Signup and view all the answers

    What is the key virulence factor for Streptococcus pneumoniae?

    <p>Capsular polysaccharide</p> Signup and view all the answers

    Which of the following is a characteristic of old Streptococcus pneumoniae colonies?

    <p>Collapsed center with a coin-like appearance</p> Signup and view all the answers

    Which drug is the drug of choice for treating pneumonia caused by penicillin-sensitive Streptococcus pneumoniae?

    <p>Penicillin</p> Signup and view all the answers

    Which group of Viridans Streptococci has the group D antigen?

    <p>S. bovis group</p> Signup and view all the answers

    What is the main mechanism by which Streptococcus pneumoniae evades the host immune system?

    <p>Expressing a capsular polysaccharide</p> Signup and view all the answers

    Which age group is most commonly affected by Streptococcus pneumoniae otitis media?

    <p>Children under 3 years old</p> Signup and view all the answers

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