Quiz 6

What test presumptively differentiates β-hemolytic group A streptococci and nonhemolytic group D enterococci from other streptococcal species?

PYR

What is the name of the test presumptively used to identify group B streptococci?

CAMP

What test can be used to differentiateStreptococcus agalactiae from other β-hemolytic streptococci?

Hippurate hydrolysis

What is the cellular structure that Streptococcus pyogenes relies on for its virulence?

M proteins

Which of the following is the drug of choice for treating most streptococcal infections?

Penicillin

What test is used as a presumptive identification of Streptococcus pneumoniae

Optochin

What is one of the most common diseases caused by streptococci?

Strep throat

What is the hemolysin responsible for hemolysis on SBA incubated anaerobically?

Streptolysin O

Most doctors' offices use the rapid throat swab methods to identify Streptococcus pyogenes. If the test is positive, the physician treats the patient. What should happen if the test is negative

The physician should order a throat culture and send the sample to microbiology lab.

All of the following are additional virulence factors associated with group A Streptococcus except:

enterotoxins.

Streptokinase is an enzyme produced by group A streptococci that:

lyses fibrin clot

Common schemes to classify streptococci include all the following except:

physiologic characteristics