Foodborne Dz: Bacterial Flashcards Preview

RUSVM Epi Summer 17 > Foodborne Dz: Bacterial > Flashcards

Flashcards in Foodborne Dz: Bacterial Deck (65)
Loading flashcards...
1

What bacterial foodborne illnesses do not colonize the intestinal tract, or replicate in the body?

Intoxication only

Bacteria replicates in food and produces a toxin within that food

2

A foodborn illness caused by a bacterial infection will colonize in the _________

GI tract

3

What bacteria associated with foodborne illnesses are infectious via intoxication?

Staph aureus
Bacillus cereus
Clostridium botulinum
Clostridium perfringens

4

Bacterial toxins are named by _____ and by target ______

Type and target tissue

5

What bacteria produce exotoxins? What bacteria produce endotoxins?

Gram positive = Exo

Gram negative = endo

6

When will you see signs associated with bacterial intoxication? What is the usual duration?

Onset is usually rapid: 30min - 6hr most commonly (up to 12hrs)

Duration is usually 1-2 days

***Botulism toxin is an exception***

7

When will you see signs associated with a bacterial infection from food? How long do they last and what are they?

Onset = several hours to days

Illness usually lasts for several days

Many produce enterotoxins that cause watery dhr: ranging from mild to severe

Invasive species or species with toxins that kill enterocytes cause dysentery, fever, and possible septicemia **dehydration

8

What temperature range is considered the food danger zone?

40-140F

9

What is the reservoir of staph aureus?

Skin and nose of (many healthy) people

10

How is staph aureus transmitted?

Vehicle: food - contaminated with S. aureus and stored at temps good for growth and toxin production

11

What is the most common foodborne intoxication?

S. aureus

12

What is the incubation time of S. aureus and the duration of intoxication?

30mins - 6 hours

Duration = +/- 24 hours

13

What clinical signs are associated with S. aureus intoxication?

Vomiting, dhr, cramping

14

How is S. aureus prevented?

Proper food hygiene and proper food storage (temp is important!!)

15

Bacillus cereus is a gram _____, soil dwelling, rod shaped, spore forming bacterium

POSITIVE

reservoir = soil

aka "fried rice syndrome"

16

How is bacillus cereus transmitted?

Vehicle = food. Contaminated with bacteria or spores and stored at temps good for growth and toxin production

17

T/F: Bacillus cereus is killed via cooking

FALSE

18

What are the two forms of Bacillus cereus intoxication and what are the associated clinical signs?

1. Enteric form = Nausea/vomiting. Incubation is 30min to 6hr

2. Diarrhea form = diarrhea and cramping. Incubation period 8-16 hours

19

How is Bacillus cereus prevented?

Proper food hygiene
Proper food storage (temp)

20

What is the reservoir of clostridium botulinum?

Soil; sediments (stream, lake, and coastal); intestinal tracts of fish and mammmals; gills and viscera of crabs/shellfish; honey

21

What is the mode of transmission of C. botulinum?

Vehicle: Food contaminated with spores at production and then improperly processed allowing growth and toxin production

22

C. botulinum is mostly associated with what preservation process of foods?

Canning

23

What is the time frame of clinical onset of C. botulinum intoxication?

18 - 36 hours
(up to 8 days)

24

What are the clinical signs associated with Botulism?

Typically will start with ocular signs - blurred vision, double vision, drooping eyes. Then a descending paralysis

25

What food should be avoided in infants less than 12 months?

Honey

Can contain C. botulinum spores that are able to sporulate within the GI tract of infants

26

If a patient is suspected to have Botulism, does treatment begin before lab test results are completed?

YES

27

How do you prevent C. botulinum intoxications?

Avoid contamination of food

Don't feed honey to children less than 12 months of age

Proper food preparation

28

What is the reservoir for clostridium perfringens?

Soils, sediments, intestinal tracts of people and animals

29

What is the MOT for C. perfringens?

Vehicle: foods contaminated at production, processing, or preparation

30

What is the incubation period and duration of C. perfringens intoxication?

Incubation = 8-22 hours

Duration = 24 hrs