Microbiology - Systems (Pg. 174-177) - C

Question 1

NL flora - Skin

Answer 1

S epidermidis

Question 2

NL flora - Nose

Answer 2

S epidermidis; colonized by S aureus

Question 3

NL flora - Oropharynx

Answer 3

Viridans group streptococci

Question 4

NL flora - Dental Plaque

Answer 4

S mutans

Question 5

NL flora - Colon

Answer 5

B fragilis > E coli

Question 6

NL flora - Vagina

Answer 6

Lactobacillus, colonized by E coli and group B strep

Question 7

Food-borne illness - B cereus (Source)

Answer 7

Reheated rice (Rapid onset)

Question 8

Food-borne illness - C botulinum (Source)

Answer 8

Improperly canned foods (toxins), raw honey (spores)

Question 9

Food-borne illness - C perfringens (Source)

Answer 9

Reheated meat

Question 10

Food-borne illness - E coli O157:H7 (Source)

Answer 10

Undercooked meat

Question 11

Food-borne illness - L monocytogenes (Source)

Answer 11

Deli meats, soft cheeses

Question 12

Food-borne illness - Salmonella (Source)

Answer 12

Poultry, meat, and eggs

Question 13

Food-borne illness - S aureus (Source)

Answer 13

Meats, mayonnaise, custard; preformed toxin (Rapid onset)

Question 14

Food-borne illness - V parahaemolyticus and V vulnificusa (Source)

Answer 14

Contaminated seafood / V vulnificus can also cause wound infections from contact with contaminated water or shellfish

Question 15

Diarrhea - Campylobacter (Type/Features)

Answer 15

• Bloody Diarrhea

- Comma- or S-shaped organisms; growth at 42°C

Question 16

Diarrhea - E histolytica (Type/Features)

Answer 16

• Bloody Diarrhea

- Protozoan; amebic dysentery; liver abscess

Question 17

Diarrhea - Enterohemorrhagic E coli (Type/Features)

Answer 17

• Bloody Diarrhea

- O157:H7; can cause HUS; makes Shiga-like toxin

Question 18

Diarrhea - Enteroinvasive E coli (Type/Features)

Answer 18

• Bloody Diarrhea

- Invades colonic mucosa

Question 19

Diarrhea - Salmonella (non- typhoidal) (Type/Features)

Answer 19

• Bloody Diarrhea

- Lactose ⊝; flagellar motility; has animal reservoir, especially poultry and eggs

Question 20

Diarrhea - Shigella (Type/Features)

Answer 20

• Bloody Diarrhea

- Lactose ⊝; very low ID50; produces Shiga toxin (human reservoir only); bacillary dysentery

Question 21

Diarrhea - Y enterocolitica (Type/Features)

Answer 21

• Bloody Diarrhea

- Day care outbreaks, pseudoappendicitis

Question 22

Diarrhea - C difficile (Type/Features)

Answer 22

• Watery Diarrhea

- Pseudomembranous colitis; associated with antibiotics and PPIs; occasionally bloody diarrhea

Question 23

Diarrhea - C perfringens (Type/Features)

Answer 23

• Watery Diarrhea

- Also causes gas gangrene

Question 24

Diarrhea - Enterotoxigenic E coli (Type/Features)

Answer 24

• Watery Diarrhea

- Travelers’ diarrhea; produces heat-labile (LT) and heat-stable (ST) toxins

Question 25

Diarrhea - Protozoa (Type/Features)

Answer 25

• Watery Diarrhea

- Giardia, Cryptosporidium

Question 26

Diarrhea - V cholerae (Type/Features)

Answer 26

• Watery Diarrhea

- Comma-shaped organisms; rice-water diarrhea; often from infected seafood

Question 27

Diarrhea - Viruses (Type/Features)

Answer 27

• Watery Diarrhea

- Rotavirus, norovirus, adenovirus