Gram Positive Cocci

Question 1

Group A strep S. pyogenes

Answer 1

• Cocci
• catalase negative
• beta-hemolytic

Question 2

Group A strep S. pyogenes disease correlation and clinical presentation

Answer 2

Disease: Strep throat

Symptoms:

• Red swollen throat & tonsils
• purulent tonsillar exudate
• fever
• cervical lymphadenopathy (LAD)

Question 3

Group A strep S. pyogenes Diagnosis technique

Answer 3

RADT culture

Question 4

Group A strep S. pyogenes treatment

Answer 4

penicillin

Question 5

Group B strep S. agalactiae

Answer 5

• Cocci
• catalase
• negative beta-hemolytic

Question 6

Group B strep S. agalactiae disease correlation

Answer 6

• neonatal meningitis
• pneumonia
• sepsis

Question 7

Group D strep Enterococcus

Answer 7

• catalase negative
• variable-hemolytic (most alpha)

Question 8

Group D strep Enterococcus disease correlation

Answer 8

• UTI
• biliary tract infection
• endocarditis

Question 9

Strep pneumoniae

Answer 9

• diplococci
• catalase negative
• alpha-hemolytic

Question 10

S. pneumoniae virulence factor

Answer 10

polysaccharide capsule

Question 11

S. pneumoniae disease correlation

Answer 11

• pneumonia
• meningitis
• otitis media

Question 12

Viridans strep

Answer 12

• catalase negative
• alpha-hemolytic (most)

Question 13

Viridans strep disease correlation

Answer 13

• dental - S. mutans
• endocarditis
• abscesses

Question 14

S. aureus

Answer 14

• Other stain: coagulase positive
• cocci - clusters
• catalase positive beta-hemolytic

Question 15

S. aureus virulence factor

Answer 15

produces toxin coagulase positive

Question 16

S. aureus disease correlation

Answer 16

• endocarditis
• septic
• arthritis
• toxic shock syndrome
• hospital acquired PNA surgical wound infections
• folliculitis
• cellulitis
• impetigo
• bacterial conjunctivitis

Question 17

MRSA

Answer 17

• Other stain: coagulase positive
• cocci - clusters
• catalase positive
• beta-hemolytic

Question 18

MRSA virulence factor

Answer 18

produces toxin coagulase positive

Question 19

Staph epidermidis

Answer 19

• Other stain: coagulase negative
• cocci-clusters
• catalase positive

Question 20

Staph epidermidis virulence factor

Answer 20

Biofilm

Question 21

Staph epidermidis disease correlation

Answer 21

infections of urine catheters, prostheses, etc

Question 22

Staph saprophyticus

Answer 22

• coagulase negative
• cocci-clusters
• catalase positive

Question 23

Staph saprophyticus disease correlation

Answer 23

UTI

Question 24

What are the aerobic gram-positive cocci?

Answer 24

Staph:

1. S. aureus
2. S. saprophyticus
3. S. epidermidis

Strep:

1. S. pneumoniae
2. S. pyogenes
3. S. galactiae
4. Enterococcus

Question 25

Which are coagulase-positive?

Answer 25

Staphylococcus aureus

Question 26

Which are coagulase-negative?

Answer 26

Staphylococcus: S. epidermidis S. saprophyticus

Question 27

Which bacterias are aerobic catalase-positive?

Answer 27

Staphylococcus * S. aureus * S. epidermidis * S. saprophyticus

Question 28

Which bacterias are aerobic catalase-negative?

Answer 28

1. Group D strep *Enterococcus* 2. Streptococci * S. pneumoniae * Viridans group *Strep* * Group A S. pyogenes * Group B S. agalactiae

Question 30

What are the alpha-hemolytic bacterias?

Answer 30

1. *S. pneumoniae* 2. Viridans group *Strep*

Question 31

What are the Beta-hemolytic bacterias?

Answer 31

Group A *S. pyogenes* Group B *S. agalactiae*