Microbiology Quiz: Streptococcus Identification

What is the aim of the Catalase activity test?

• To determine the type of RBCs hemolysis

• To distinguish Streptococcus pneumoniae from other alpha-hemolytic streptococci

• To determine the ability of microorganisms to produce catalase enzyme

• To identify the species responsible for strep throat

Which Streptococcus species is responsible for strep throat?

• S. pneumoniae

• S. pyogens

• S. viridans

• S. faecalis

What is the principle of the Bile solubility test?

• S. pneumoniae is inhibited by optochin

• To distinguish Streptococcus pyogenes from other beta-hemolytic streptococci

• Bile salts cause lysis of sensitive bacteria

• To determine the type of RBCs hemolysis

What is the aim of the Optochin blood test?

• To determine the ability of microorganisms to produce catalase enzyme

• To distinguish Streptococcus pneumoniae from other alpha-hemolytic streptococci

• To determine the type of RBCs hemolysis

• To identify the species responsible for strep throat

What is the result of the Bacitracin test for Streptococcus pyogenes?

• Bile soluble

• Inhibited by optochin

• Sensitive

• Resistant

What is the major clinical significance of Streptococcus?

• Throat infection

• Necrotizing fasciitis

• Cellulitis

• Pink eye

What is the result of the Catalase activity test for Streptococcus?

• Effervescent

• No effervescent

• Green hemolysis

• Partial hemolysis

What is the principle of the Quellung test?

• To determine the type of RBCs hemolysis

• Bile salts cause lysis of sensitive bacteria

• Capsular swelling test for S. pneumonia

• To distinguish Streptococcus pyogenes from other beta-hemolytic streptococci

What is the result of the Culture on blood agar for S. faecalis?

• Complete RBCs lysis

• Partial hemolysis

• No hemolysis

• Hb → met-Hb

What is the type of medium used in the Chocolate Agar test?

• Enriched medium

• Solid medium

• Differential medium

• Selective medium