Microbiology Unit 13: Streptococcus Genus
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Microbiology Unit 13: Streptococcus Genus

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Questions and Answers

Which of the following is a characteristic of Streptococcus spp.?

Capnophilic growth

What is the significance of lactic acid production by some Streptococcus spp.?

Causes caries

What is the classification based on complete hemolysis in blood agar for streptococci?

Beta-hemolytic

What distinguishes streptococci from staphylococci?

<p>Catalase production</p> Signup and view all the answers

What type of growth favors Streptococcus spp.?

<p>High CO2 concentration</p> Signup and view all the answers

What is the microbiological arrangement of Streptococcus spp.?

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

Which Streptococcus species is associated with dental plaque formation and caries production?

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

Which group does Streptococcus pneumoniae belong to based on its hemolytic characteristics?

<p>It is not classified based on hemolytic characteristics</p> Signup and view all the answers

Which Streptococcus species is known for its capsule formation?

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

Which Streptococcus group is generally involved in subacute endocarditis?

<p>Viridans streptococci</p> Signup and view all the answers

Which Streptococcus species is non-capsulated and has poor cariogenic capacity?

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

Which Streptococcus species is sensitive to optochin and soluble in the presence of bile salts?

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

Which Streptococcus group includes species with a great mucous layer and glucans involved in plaque formation?

<p>Streptococcus mutans group</p> Signup and view all the answers

Which of the following is a virulence factor of Streptococcus pyogenes?

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

What is the main difference between Streptococcus pneumoniae and Streptococcus viridans in terms of bile solubility and optochin sensitivity?

<p>Streptococcus pneumoniae is bile soluble and optochin sensitive, while Streptococcus viridans is not.</p> Signup and view all the answers

Which of the following diseases is NOT caused by Streptococcus pyogenes?

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

What type of hemolysis is associated with Streptococcus pyogenes?

<p>β-hemolysis</p> Signup and view all the answers

Which virulence factor of Streptococcus pyogenes is responsible for inhibiting phagocytosis in non-immune humans?

<p>M protein</p> Signup and view all the answers

What is the characteristic feature of the colonies of Streptococcus pyogenes on blood agar?

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

Which enzyme produced by Streptococcus pyogenes facilitates the spreading of the bacteria by dissolving the fibrin clot?

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

What type of infection does Streptococcus pyogenes cause that results in scarlet fever?

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

What autoimmune disease can be caused by Streptococcus pyogenes after pharyngitis or skin infection?

<p>Acute rheumatic fever</p> Signup and view all the answers

What is the treatment of choice for mild infections caused by Streptococcus pyogenes?

<p>Oral penicillin or amoxicillin</p> Signup and view all the answers

What type of pathogen is Streptococcus pneumoniae?

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

What is the main cause of bacterial otitis and sinusitis according to the text?

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

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