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Questions and Answers

Which of the following is a common infection caused by Streptococcus pneumoniae?

  • Urinary tract infection
  • Gastrointestinal infection
  • Skin infection
  • Pneumonia (correct)

    • What is the shape of Streptococcus pneumoniae?

  • Pear-shaped or lanceolate (correct)
  • Spherical
  • Spiral
  • Rod-shaped

    • What is the unique cultural feature of Streptococcus pneumoniae?

  • Is not inhibited by optochin and bile salts
  • Forms beta-hemolysis on blood agar plates (correct)
  • Forms large colonies on blood agar plates
  • Grows in culture medium enriched with organic liquids

    • What is the main factor of virulence of pneumococci?

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

    What is the function of coagulase in Staphylococcus aureus?

    <p>Converts fibrinogen to fibrin</p> Signup and view all the answers

    What is the characteristic of the mucus in people with cystic fibrosis?

    <p>Thick and sticky</p> Signup and view all the answers

    What is the main morphological characteristic of staphylococci?

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

    Which toxin is responsible for inducing a potent immune stimulation and causing toxic shock syndrome?

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

    What is the function of Protein A in S. aureus?

    <p>It binds IgG molecules by their Fc region</p> Signup and view all the answers

    Which type of infection is caused by S. aureus growing in the vagina and releasing toxin in the blood?

    <p>Toxic shock syndrome</p> Signup and view all the answers

    What is the difference between the colonies formed by S. aureus and S. epidermis on blood agar plates?

    <p>S. aureus forms golden colonies and S. epidermis forms white colonies</p> Signup and view all the answers

    Which of the following infections can be caused by Streptococcus pneumoniae?

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

    What is the shape of Streptococcus pneumoniae?

    <p>Pear-shaped or lanceolate</p> Signup and view all the answers

    What is the unique cultural feature of Streptococcus pneumoniae?

    <p>Forms small colonies on blood agar plates surrounded by a halo of alpha-hemolysis</p> Signup and view all the answers

    Which toxin is responsible for causing scalded skin syndrome in neonates?

    <p>Exfoliative toxin</p> Signup and view all the answers

    What is the function of Protein A in S. aureus?

    <p>Binds IgG molecules by their Fc region</p> Signup and view all the answers

    Which type of infection is caused by S. aureus growing in the vagina and releasing toxin in the blood?

    <p>Toxic shock syndrome</p> Signup and view all the answers

    What is the characteristic of the colonies formed by S. epidermidis on blood agar plates?

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

    What is the main factor of virulence of Streptococcus pneumoniae?

    <p>IgA Protease</p> Signup and view all the answers

    What is the function of pneumolysin in Streptococcus pneumoniae?

    <p>It acts on ciliated epithelial cells</p> Signup and view all the answers

    Which species of Staphylococcus is coagulase-negative?

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

    What is the main characteristic of the mucus in people with cystic fibrosis?

    <p>It is sticky and thick</p> Signup and view all the answers

    Which type of infections can be caused by Streptococcus pneumoniae?

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

    What is the shape of Streptococcus pneumoniae?

    <p>Pear-shaped</p> Signup and view all the answers

    What is the unique cultural feature of Streptococcus pneumoniae?

    <p>Growth inhibited by optochin and bile salts</p> Signup and view all the answers

    Which of the following is a characteristic of the capsule of pneumococci?

    <p>It inhibits complement activity</p> Signup and view all the answers

    Which of the following is a factor that mediates colonization in the oropharynx and subsequent migration to the lungs in pneumococci?

    <p>IgA Protease</p> Signup and view all the answers

    Which of the following is a characteristic of Staphylococcus aureus colonies on solid media?

    <p>Golden-colored</p> Signup and view all the answers

    Which of the following is a characteristic of people with cystic fibrosis?

    <p>They have thick, sticky mucus in their airways</p> Signup and view all the answers

    What is the function of coagulase in Staphylococcus aureus?

    <p>It converts fibrinogen to fibrin, covering the bacterium and protecting it from phagocytosis</p> Signup and view all the answers

    What is the main function of Protein A in S. aureus?

    <p>It binds IgG molecules by their Fc region, disrupting opsonization and phagocytosis</p> Signup and view all the answers

    Which toxin is responsible for causing scalded skin syndrome in neonates?

    <p>Exfoliative toxin</p> Signup and view all the answers

    Where is S. saprophyticus often found and what infections can it cause?

    <p>It is often found in young sexually active women and can cause urinary tract infection with dysuria and pyuria</p> Signup and view all the answers

    Which of the following is a common infection caused by Streptococcus pneumoniae?

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

    What is the shape of Streptococcus pneumoniae?

    <p>Pear-shaped</p> Signup and view all the answers

    What is the unique cultural feature of Streptococcus pneumoniae?

    <p>Growth inhibited by bile salts</p> Signup and view all the answers

    Which toxin acts as a superantigen inducing a potent immune stimulation?

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

    Which protein is only present in S. aureus and binds IgG molecules by their Fc region?

    <p>Protein A</p> Signup and view all the answers

    Which enzyme is responsible for the degradation of lipids (sebum) with antimicrobial activity in the skin?

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

    Which strain of S. aureus is often found in young sexually active women as a cause of urinary tract infection with dysuria and pyuria?

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

    Which of the following is a characteristic of Staphylococcus aureus colonies on solid media?

    <p>They are white</p> Signup and view all the answers

    Which factor is responsible for the protection of pneumococci from phagocytosis and inhibition of complement activity?

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

    What is the main function of coagulase in Staphylococcus aureus?

    <p>It determines the enveloping of fibrinogen around bacterial cell, interfering the phagocytosis</p> Signup and view all the answers

    What is the main morphological change in a patient with meningitis?

    <p>Inflammation of the meninges</p> Signup and view all the answers

    Which of the following is a characteristic of Streptococcus pneumoniae colonies on blood agar plates?

    <p>They form small colonies surrounded by a halo of alpha-hemolysis</p> Signup and view all the answers

    What type of metabolism does Streptococcus pneumoniae use?

    <p>Fermentative metabolism</p> Signup and view all the answers

    What is the main factor responsible for the protection of Streptococcus pneumoniae from phagocytosis and inhibition of complement activity?

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

    What is the main factor of virulence of pneumococci?

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

    What is the main function of coagulase in Staphylococcus aureus?

    <p>Converts fibrinogen into fibrin</p> Signup and view all the answers

    Which of the following is a characteristic of people with cystic fibrosis?

    <p>Reduced activity of macrophages</p> Signup and view all the answers

    Which of the following is a common infection caused by Staphylococcus aureus?

    <p>Skin infections</p> Signup and view all the answers

    What is the function of coagulase in Staphylococcus aureus?

    <p>It converts fibrinogen into fibrin, which covers the bacterium and protects it from phagocytosis.</p> Signup and view all the answers

    What is the function of Protein A in S. aureus?

    <p>It binds IgG molecules by their Fc region, disrupting opsonization and phagocytosis.</p> Signup and view all the answers

    What is the main characteristic of Staphylococcus aureus colonies on solid media?

    <p>They form golden colonies.</p> Signup and view all the answers

    What type of infection is caused by S. saprophyticus and where is it often found?

    <p>Urinary tract infections in young sexually active women.</p> Signup and view all the answers

    Which type of infections can be caused by Streptococcus pneumoniae?

    <p>Both forms at the level of the upper respiratory tract and serious and invasive forms such as pneumonia, meningitis and sepsis</p> Signup and view all the answers

    What is the unique cultural feature of Streptococcus pneumoniae?

    <p>Optochin and bile salts sensitivity</p> Signup and view all the answers

    What is the main site of residence of Streptococcus pneumoniae?

    <p>Upper respiratory tract</p> Signup and view all the answers

    What is the function of Protein A in Staphylococcus aureus?

    <p>It binds IgG molecules by their Fab region.</p> Signup and view all the answers

    Which toxin is responsible for inducing a potent immune stimulation in Staphylococcus aureus?

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

    What is the characteristic of Staphylococcus epidermidis colonies on solid media?

    <p>White colonies</p> Signup and view all the answers

    Which strain of Staphylococcus is often found in young sexually active women as a cause of urinary tract infection with dysuria and pyuria?

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

    Which of the following is a characteristic of people with cystic fibrosis?

    <p>They have reduced activity of macrophages.</p> Signup and view all the answers

    What is the function of pneumolysin in Streptococcus pneumoniae?

    <p>It creates pores in cholesterol-containing membranes.</p> Signup and view all the answers

    What is the main function of coagulase in Staphylococcus aureus?

    <p>It determines the enveloping of fibrinogen around bacterial cell.</p> Signup and view all the answers

    What is the unique cultural feature of Streptococcus pneumoniae?

    <p>It produces golden-colored colonies on solid media.</p> Signup and view all the answers

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