Microbiology Quiz

Which type of Streptococci causes complete lysis of RBCs?

• Non-hemolytic

• Gamma-hemolytic

• Beta-hemolytic

• Alpha-hemolytic

What is the major virulence factor of Streptococcus pyogenes?

• Capsule

• M protein

• Lipoproteinase

• F protein

Which Streptococci is further classified into more than 80 serotypes according to M protein antigen?

• S. agalactiae

• S. viridans

• S. pneumoniae

• S. pyogenes

What is the main virulence factor of Pneumococci?

• IgA1 protease

• Capsule

• Pneumolysin

• Autolysin

Which Streptococci are Gram-positive cocci arranged mostly in pairs?

• Anaerobic streptococci

• Streptococci pyogenes

• Enterococci

• Viridians streptococci

What is the main method for diagnosing Pneumococcal infections?

• Quelling reaction

• Gram staining

• ELISA

• Blood culture

Which Streptococci are further classified into serogroups (A-U) according to carbohydrate antigen?

• S. agalactiae

• S. viridans

• S. pyogenes

• S. pneumoniae

What is the primary cultivation medium for Streptococci?

• Nutrient agar

• MacConkey's agar

• Chocolate agar

• Blood agar

Which Streptococci are considered the most important pathogen to man?

• S. viridans

• S. pyogenes

• S. agalactiae

• S. pneumoniae

What is the main method for diagnosing Enterococci infections?

• Blood culture

• Gram staining

• ELISA

• Quelling reaction