questions 2

Microbiology of Diarrhea and Food Poisoning

Topic updated on 02/14/17 5:15pm

 Bugs Causing Diarrhea and Food Poisoning
Staphylococcus aureus Custards, mayonnaise/potato salad, canned meats Symptoms start and end quickly
Bacillus cereus Reheated rice, food kept warm but not hot Symptoms start and end quickly
Clostridium botulinum Canned food, home-canned alkaline vegetables --
Clostridum perfringens Reheated meat Watery diarrhea
Clostridium difficile Endogenous, nosocomial
NOTE: not food poisoning
Watery diarrhea
E. coli (EHEC - no invasion, no WBCs; EIEC - invasion + WBCs) Undercooked meat, contaminated food, fecal-oral Bloody diarrhea 
E. coli (ETEC) Undercooked meat, contaminated food, fecal-oral Watery diarrhea
Legionella pneumophila contaminated water (especially in smokers) Pneumonia, fever, diarrhea, hyponatremia
Salmonella enteridis Chicken products (eggs, raw chicken) Diarrhea may be bloody
Shigella dysenteriae Fecal-oral Bloody diarrhea
Campylobacter jejuni Poultry, unpasteurized milk, fecal-oral Bloody diarrhea with pus
Vibrio cholerae Fecal-oral Watery diarrhea ("rice water stools")
Vibrio parahaemolyticus/vulnificus Seafood, sushi (leading cause of diarrhea in Japan) --
Yersinia enterocolitica Contaminated milk, pork, pet feces Bloody diarrhea
Brucella Unpasteurized dairy products --
Adenovirus Fecal-oral Watery diarrhea
Norwalk virus Fecal-oral Watery diarrhea
Reovirus Fecal-oral --
Rotavirus Fecal-oral Watery diarrhea
Infant mortality
Giardia lamblia Fecal-oral Watery diarrhea
Associated with campers/hikers
Entamoeba histolytica Fecal-oral Bloody or watery diarrhea
Cryptosporidium Fecal-oral Watery diarrhea 
Diarrhea in AIDS
Taenia solium Pork Intestinal tapeworm, neurocysticercosis
Taenia saginata Beef Intestinal tapeworm
Diphyllobothrium latum Fish Intestinal tapeworm


Qbank (2 Questions)

(M1.MC.35) A 23-year-old man returns from vacation in Eastern Europe. He reports he had been eating new, strange foods, and had been swimming daily in a local river for exercise. He reports that since returning home, he has had daily watery diarrhea. He denies having any blood in his stools. You order a particular stool test, and the results are shown in Figure A. What is the cause of his diarrhea? Topic Review Topic
FIGURES: A          

1. Giardia
2. Cryptosporidium
3. E. coli
4. S. aureus
5. B. cereus

(M1.MC.79) A 27-year-old male presents to the emergency room with a chief complaint of bloody diarrhea. He reports feeling lightheaded, with intermittent, severe abdominal pain, and notes that last night for dinner, he ate a hamburger, salad, and a leftover piece of bacon. On exam, his blood pressure is 108/76 mmHg, heart rate is 98 beats per minute, temperature is 99.4 degrees Fahrenheit, and respiratory rate is 12 breaths per minute. Which of the following is LEAST likely to be the cause of his symptoms? Topic Review Topic

1. Shigella dysenteriae
2. Salmonella enteriditis
3. Enterotoxogenic Escherichia coli (ETEC)
4. Enterohemorrhagic Escherichia coli (EHEC)
5. Yersinia enterocolitica


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