MUST KNOW

Question 1

fever producing and flesh-eating bacteria

Answer 1

Streptococcus pyogenes

Question 2

serological test to detect recent infections with S. pyogenes

Answer 2

Anti-streptolysin O

<200 Todd units/mL (+)

Question 3

solubilizes the ground substance of mammalian tissues

Answer 3

hyaluronidase

Question 3

oxygen stable, non-antigenic hemolysin responsible for the SURFACE hemolysis on BAP

Answer 3

streptolysin S

Question 3

principal virulence factor of group A strep

Answer 3

protein M

Question 4

oxygen-labile, antigenic hemolysin responsible for the SUBSURFACE hemolysis on BAP

Answer 4

streptolysin O

Question 4

what binds to plasminogen to activate plasmin?

Answer 4

streptokinase

Question 5

degrades proteins and mediated rashes caused by scarlet fever

Answer 5

Exotoxin B (cysteine protease)

Question 6

how to diagnose strep throat?

Answer 6

throat swab (culture) or direct antigen detection

Question 7

symptom of scarlet fever

Answer 7

strawberry colored tongue

Question 7

susceptibility test for scarlet fever and positive result

Answer 7

Dick’s test (erythrogenic toxin test)

(+) erythema or redness of skin

Question 8

confirmatory test for scarlet fever and its positive result

Answer 8

Schultz-charlton (anti-erythrogenic toxin test)

(+) blanching phenomenon

Question 9

T or F.

cellulitis is a noncommunicable infection of subcutaneous skin tissue characterized by redness and edema

Answer 9

F.

cellulitis is CONTAGIOUS

Question 10

acute infection of the dermal layer of the skin with swollen reddish spots

Answer 10

erysipelas

Question 11

a complication of pharyngitis

Answer 11

rheumatic heart fever

Question 11

may lead to necrotizing fasciitis, also known as galloping gangrene or flesh eating bacteria

Answer 11

impetigo

Question 11

also known as bright’s disease; inflammatory disease of the renal glomeruli

Answer 11

acute glomerulonephritis

Question 12

Differentiates S. pyogenes from other beta hemolytic; Helpful for identifying group A in throat culture, and; Groups C and G are also susceptible

Answer 12

Bacitracin Disk Test (0.04 units) or Taxo A

Question 12

whole organ shuts down and leads to death

Answer 12

streptococcal toxic shock syndrome

Question 13

positive result of SXT

Answer 13

(+) develops resistance
–> Group B (resistant)

MNEMONICS:

Be Resistant! C Sensitive

Question 14

this test is more specific than bacitracin. what is its positive result?

Answer 14

Pyrrolidonyl Arylamidase Test

(+) cherry red

Question 15

T or F

Group A streptococci is NOT part of the indigenous microbiota

Answer 15

T

it is a NOT normal flora

Question 16

group of streptococci that is part of the normal flora of the female genital tract and lower gastrointestinal tract

Answer 16

Group B

–> transmitted nosocomially or vertical transmission from mother to fetus