Micro - Systems (Normal Flora & GI) Flashcards Preview

FA - Microbiology > Micro - Systems (Normal Flora & GI) > Flashcards

Flashcards in Micro - Systems (Normal Flora & GI) Deck (42):
1

What is the dominant microorganism in the normal flora of the skin?

S. epidermidis

2

What is the dominant microorganism in the normal flora of the nose? What other major microorganism colonizes the nose?

S. epidermidis; colonized by S. aureus

3

What is the dominant microorganism in the normal flora of the oropharynx?

Viridans group streptococi

4

What is the dominant microorganism in the normal flora of the dental plaque?

S. mutans

5

What are 2 dominant microorganism in the normal flora of the colon? Which is more dominant?

B. fragilis > E. coli

6

What is the dominant microorganism in the normal flora of the vagina? What other 2 microorganisms colonize the vagina?

Lactobacillus, colonized by E. coli and group B strep

7

What kind of flora do neonates delivered by C-section have, and how does this change over time?

Neonates delivered by C-section have no flora but are rapidly colonized after birth

8

Which 2 bugs cause food poisoning that starts quickly and ends quickly?

S. aureus and B. cereus food poisoning starts quickly and ends quickly

9

Name 7 bugs that cause food poisoning.

(1) B. cereus (2) C. botulinum (3) C. perfringens (4) E. coli O157:H7 (5) Salmonella (6) S. aureus (7) V. parahaemolyticus and V. vulnificus

10

What is the source of infection for B. cereus food poisoning?

Reheated rice; Think: "Food poisoning from reheated rice? Be serious!" (B. cereus)

11

What is the source of infection for C. botulinum food poisoning?

Improperly canned foods (sign is bulging cans)

12

What is the source of infection for C. perfringens food poisoning?

Reheated meat dishes

13

What is the source of infection for E. coli O157:H7 food poisoning?

Undercooked meat

14

What is the source of infection for Salmonella food poisoning?

Poultry, meat, and eggs

15

What is the source of infection for S. aureus food poisoning?

Meats, mayonnaise, custard; preformed toxin

16

What is the source of infection for V. parahaemolyticus and V. vulnificus food poisoning?

Contaminated seafood

17

Besides food poisoning, what else can V. vulnificus cause?

V. vulnificus can also cause wound infections from contact with contaminated water or shellfish

18

Name 7 bugs that cause bloody diarrhea.

(1) Campylobacter (2) E. histolytica (3) Enterohemorrhagic E. coli (4) Enteroinvasive E. coli (5) Salmonella (6) Shigella (7) Y. enterocolitica

19

What is the morphology of Campylobacter? In what conditions do they grow?

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

20

What kind of organism is E. histolytica? What is the main condition that it causes? What other physical/imaging finding is common?

Protozoan; Amebic dysentery; Liver abscess

21

What is the main strain of Enterohemorrhagic E. coli (EHEC) associated with bloody diarrhea? What condition can EHEC cause? What toxin does it make?

O157:H7; Can cause HUS; Makes Shiga-like toxin

22

How does enteroinvasive E. coli cause bloody diarrhea?

Invades colonic mucosa

23

Does either Salmonella or Shigella ferment lactose?

No, both are lactose (-)

24

Does Salmonella or Shigella have flagella motility?

Salmonella

25

What kind of reservoir does Salmonella have? What are 2 especially common sources of infection?

Has animal reservoir, especially poultry and eggs

26

What kind of infective dose dose shigella have?

Very low ID50 (i.e., median infective dose)

27

What kind of toxin does Shigella produce? What kind of reservoir does it have?

Produces Shiga toxin (human reservoir only)

28

Other than bloody diarrhea, what condition can Shigella cause?

Bacillary dysentery

29

In what setting do Y. enterocolitica outbreaks typically occur?

Day-care outbreaks

30

With what condition is Y. enterocolitica associated?

Pseudoappendicitis

31

Name 6 bugs that cause watery diarrhea.

(1) C. difficile (2) C. perfringens (3) Enterotoxigenic E. coli (4) Protozoa (5) V. cholerae (6) Viruses

32

Other than diarrhea, what condition does C. difficile cause?

Pseudomembranous colitis

33

What kind of diarrhea can C. difficile cause?

Watery diarrhea, Occasionally bloody diarrhea

34

What causes C. difficile?

Caused by antibiotics

35

Besides watery diarrhea, what other major symptom/condition does C. perfringens also cause?

Also causes gas gangrene

36

What organism is associated with Traveler's diarrhea?

Enterotoxigenic E. coli

37

What kind of toxins does Enterotoxigenic E. coli produce?

Produces heat-labile (LT) and heat-stable (ST) toxins

38

What are the 2 protozoa that can cause watery diarrhea? Which targets the immunocompromised?

(1) Giardia (2) Cryptosporidium (in immunocompromised)

39

What is the morphology of V. cholerae?

Comma-shaped organisms

40

Describe the diarrhea caused by V. cholerae.

Rice-water diarrhea

41

What is often a source of V. cholerae?

Often from infected seafood

42

What are 2 viruses that cause watery diarrhea?

(1) Rotavirus (2) Norovirus

Decks in FA - Microbiology Class (43):