Bacterial Foodborne Diseases

Question 1

Bacterial foodborne illness caused by Intoxication

Answer 1

Do not colonize intestinal tract
bacteria replicates in food (not GI Tract)
bacteria produce toxins in food

Question 2

Intoxication foodborne bacteria

Answer 2

Exotoxins (gram +) 
Staph aureus (skin flora/ pathogen)

Bacillus cereus (environmental or rice contaminate)

Clostridium botulinum (environmental soil)

Clostridium perfringens (intestinal bacterium of animals)

Question 3

Bacterial foodborne illness caused by infection

Answer 3

many bacteria organism

Bacteria colonize the GI tract

Question 4

Bacterial toxins names by

Answer 4

1. type

2. target tissue

Question 5

Infection foodborne bacteria

Answer 5

Endotoxins (gram -)
Campylobacter jejuni
Salmonella
E. coli
Vibrio cholera
Listeria monocytogenese

Question 6

Symptoms of intoxication

Answer 6

rapid onset ( 30 min - 6 or 12 hours)
illness lasts ~1 - 2 days

Exception is Botulism (neurotoxin)

Question 7

Symptoms of infection

Answer 7

onset is hours- days
illness last days
many produce enterotoxins = watery diarrhea (mild-mod)
killing of enterocytes cause
       dysentery, fever, septicemia

Question 8

Staphylococcus aureus

reservoir, transmission, coin signs, prevention

Answer 8

gram + clusters of cocci

   skin and nose of healthy people 

   vehicle transmission: food contaminated with s. aureus

    V/D, cramping, short duration (+/- 24 hrs)

    proper food hygiene and storage

Question 9

What is the most common food borne intoxication

Answer 9

Staphylococcus aureus

Question 10

Bacillus cereus

reservoir, transmission, coin signs, prevention

Answer 10

Gram + soil dwelling rod shaped spore forming bacteria

    soil is natural habitat
    vehicle food transmission 

    2 forms of clinical signs

             1. Enteric form (IP = 30 min - 6 hrs)
                      - nausea / vomiting

             2. Diarrhea form (IP = 8 -16 hrs)
                      - diarrhea cramping

    Food hygiene and storage

Question 11

Campylobacter jejuni

reservoir, transmission, prevention

Answer 11

normal intestinal flora of many species (birds & mammals)

very fragile
vehicle is contaminated food/water
low infectious dose
Direct contact

target the vehicle
OFFS, hygiene, pasteurization, proper handling

Question 12

Salmonella spp.

reservoir, transmission, prevention

Answer 12

rod shaped gram -

widespread GI flora in many animals

Pre and post harvest

Question 13

Salmonella Enteritidis

Answer 13

causes egg- associated salmonellosis

Eating raw or undercooked eggs

Question 14

E. coli

reservoir, transmission, prevention

Answer 14

rod shaped gram - bacterium

enteric bacteria found in many animals

vehicle contaminated food and meat

Pre and Post harvest

Question 15

Vibrio cholerae

reservoir, transmission, coin signs, prevention

Answer 15

Comma shaped gram (-) bacterium

people and natural in brackish rivers & coastal waters

Water contamination most important
Food contaminated by water

Infection + enterotoxin = WATERY DIARHHEA

Sanitation of sewage and proper food preparation

Question 16

Listeria monocytogenes

reservoir, transmission, clin signs, prevention

Answer 16

soil, water, animals

infected food is vehicle

mild food poisoning, flu like symptoms

Meat hygiene, pasteurize, food prep (cook/wash)

Question 17

Prevention of Foodborne Infection

Answer 17

Target the vehicle because no toxins are produced in food

  OFFS
  Meat hygiene    
  pasteurize milk
  proper handling/ cooking of food
  Sewage management (Vibrio cholera)

Question 18

E. coli strains that cause food borne illness?

Answer 18

E.coli (STEC) O157:H7

E.coli O104: H4