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Bacterial Laboratory Diagnosis

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Questions and Answers

Which of the following bacteria is normally found as flora in the nasopharynx and oropharynx of preschool children?

Streptococcus pneumoniae (correct)

Streptococcus pyogenes

Streptococcus agalactiae

Enterococcus faecalis

What is the purpose of the hippurate hydrolysis test?

To differentiate between Streptococcus agalactiae and Streptococcus pyogenes

To detect the production of the enzyme hippuricase in microorganisms (correct)

To determine the susceptibility of Streptococcus to bacitracin

To identify the hemolytic pattern of Streptococcus pneumoniae

What is the characteristic hemolytic pattern of Streptococcus agalactiae?

Beta-hemolysis with enhanced arrowhead formation (correct)

Alpha-hemolysis

Beta-hemolysis without enhanced arrowhead formation

Gamma-hemolysis

Which of the following is NOT a characteristic of Streptococcus pyogenes?

Shows alpha-hemolysis Signup and view all the answers

Which test is used to differentiate Streptococcus pneumoniae from other organisms and involves assessing the solubility of the bacterium in bile?

Optochin Test Signup and view all the answers

What is the expected result of the hippurate hydrolysis test for Streptococcus agalactiae?

Deep purple color Signup and view all the answers

What type of Streptococci lacks the Lancefield Group Antigen and is the most common cause of Subacute Bacterial Endocarditis (SBE)?

Alphaprime Streptococci Signup and view all the answers

Which of the following is a significant characteristic of the normal flora of the Upper Respiratory Tract (URT) and Gastrointestinal Tract (GIT)?

Infecting only immunocompromised individuals Signup and view all the answers

Which bacteria are classified as Vancomycin-resistant and can cause Subacute Bacterial Endocarditis (SBE)?

Pediococcus, Leuconostoc, Enterococcus Signup and view all the answers

Which test assesses for the alpha-hemolytic characteristic of Viridans Streptococci on Blood Agar Plate (BAP)?

Optochin Test Signup and view all the answers

What is the result of a positive Schultz-Charlton test or Blanche phenomenon?

Fading of rashes Signup and view all the answers

What is the recommended treatment for necrotizing fasciitis caused by Group A Streptococci?

Surgical removal of non-viable tissues and infecting bacteria Signup and view all the answers

What is the virulence factor of Streptococcus pneumoniae that contributes to causing Neonatal Meningitis?

Capsule containing Sialic Acid Signup and view all the answers

What is one significant characteristic of Group B Streptococcus transmission?

Nosocomially transmitted by unwashed hands of mother or health care personnel Signup and view all the answers

Which test is used for the presumptive identification of Streptococcus pneumoniae?

Schultz-Charlton Test Signup and view all the answers

What is the normal flora location of Streptococcus agalactiae (Group B Streptococcus)?

Genitourinary tract Signup and view all the answers