Gram Positive Bacteria

Question 1

Staphylococcus aureus

Answer 1

Cocci
1. Excess growth
2. Growth in area not normally found
Normal Flora is outside the skin

Question 2

Folliculitis

Answer 2

Infection of the hair follicle causing red, pus-filled swollen follicles

Question 3

Impetigo

Answer 3

Small, flattened, red patches on the face and limbs which develop into pus filled vesicles that eventually crust over.
AKA pyoderma

Question 4

Toxic Shock Syndrome

Answer 4

Occurs in young women- tampons not regularly changed
Caused by TSST 1
S/Sx: Fever, Hypotension, Erythoderma wit desquamation, Profuse diarrhea, Multi-organ involvement

Question 5

Staphylococcal Scalded Skin Syndrome

Answer 5

S/Sx: Perioral erythema with sunburn like rash rapidly turning bright red then spreading to bullae which later on desquamates

Question 6

Staphylococcal Food Poisoning

Answer 6

Caused by ingestion of enterotoxin
Second most common cause of acute food poisoning
S/Sx: Acute salivation, Nausea, Vomiting, Abdominal cramps, Watery diarrhea

Question 7

Septicemia

Answer 7

Associated with age extremes, CVD, decompensated diabetes, and heroin addicts
May complicate to endocarditis

Question 8

Streptococcus pneumoniae

Answer 8

Mucopurulent sputum with pus

Question 9

Other infections caused by S. aureus

Answer 9

Sty, boil, cellulitis, impetigo, osteomyelitis
Folliculitis
Impetigo
TSS
Staphylococcal scalded skin syndrome
Staphylococcal food poisoning
Septicemia

Question 10

Streptococcus viridans

Answer 10

“green”
Normal flora of the oral cavity

Question 11

Streptocccus mutans

Answer 11

Mouth
Causes bad breath, dental carries
CHO to lactic acid
Complication: brain abscess

Question 12

Streptococcus pyogenes

Answer 12

Most virulent, important human pathogen
• CM:
1. Scarlet Fever
Aka. Scarletina, erysipelas
ID: Dick’s test
2. Impetigo
Aka pyoderma
s/s: yellow crusted lesions (face)
3. Sepsis
4. Infectious endocarditis
5. Tonsilitis, Strep throat (3-5x/yr = complications)
6. Pharyngitis

• Complications (1-4 weeks after infection)
1. Acute Rheumatic Fever: Heart murmurs, Aschoff’s nodule formation in the heart valves
2. Acute Glomerulonephritis
3. Rx: Penicillin V

Question 13

Streptococcus agalactiae

Answer 13

Normal flora of female genitalia
• CM: neonatal sepsis/meningitis (from mother)- normal delivery

Question 14

Enterococcus (faecalis, faecium, durans)

Answer 14

CM: liver, intestinal abscess and UTI

Question 15

Streptococcus bovis

Answer 15

Normal flora of the colon
• Common org. isolated among patients with colon cancer (decaying cells)