Gastrointestinal Microbiology Quiz

Gastrointestinal Microbiology

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Question 1

A college age man celebrated his birthday with friends by seeing who could eat the most raw oysters for dinner. He woke up a 4 AM with profuse watery diarrhea. What curved gram (-) rod is the most likely cause of his diarrhea?

A
Campylobacter jejuni
B
Giardia lamblia
C
Vibrio parahaemolyticus
D
Enterotoxigenic E. coli
Question 1 Explanation: 
Vibrio parahaemolyticus is a curved gram negative oxidase positive rod. It is associated with raw or under-cooked shellfish. Campylobacter jejuni is also a curved oxidase positive gram negative rod, but it is associated with handling of poultry and domestic animals, NOT shellfish.
Question 2

An 18 year old female is concerned about recent bloody diarrhea. She states that she doesn't have time for this since she recently got a job at a local restaurant breading and frying chicken. Cultures show gram negative, oxidase positive, curved rods. What organism is causing her problems?

A
Salmonella
B
Shigella
C
Clostridium difficile
D
Campylobactor jejuni
Question 2 Explanation: 
The big clues pointing to Campylobacter jejuni were handling of poultry, oxidase (+), Gram (-), and CURVED rods. Salmonella could be considered for poultry and gram (-); however, Salmonella species are not curved and they are oxidase negative.
Question 3

A patient is complains of diarrhea not long after starting a new antibiotic. What organism is most likely  infecting this patient?

A
Vibrio cholerae
B
Clostridium difficile
C
Shigella
D
Enteroinvasive E. coli
Question 3 Explanation: 
Whenever a patient starts having diarrhea after starting an antibiotic (especially clindamycin) consider C. diff as a probable cause of the diarrhea.
Question 4

Jim just went to his family reunion. He was excited to have Aunt Rosie's fried chicken and potato salad. After lunch everyone went to play kickball. Later Jim went back for seconds on the food. About 2 hours later he found himself afebrile with abdominal cramps, vomiting, and diarrhea. What organism is most likely causing his suffering?

A
Bacillus cereus
B
Norwalk virus
C
Staphylococcus aureus
D
Salmonella
Question 4 Explanation: 
Staph aureus is found on the skin. It is associated with mayonnaise, ham salad, potato salad, and cream pies. Incubation period is typically 1-6 hours before symptoms of abdominal cramping, vomiting, diarrhea, headaches, and sweating. Patients will typically present without a fever.
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