Microbiology Quiz ✨
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A 75-year-old patient develops diarrhea5 days after starting antibiotic treatment for aserious staphylococcal infection. What is themost likely causative agent? *
1 point
 A 23-year-old woman presents with mildgastroenteritis a few days after having a varietyof sushi at a party. There is no blood or pus inthe stool. Which causative agent is most likelyto have caused this illness? *
1 point
A 45-year-old man who recently returnedfrom Africa has been febrile for several daysand now presents with abdominal pain. Hisblood cultures grow out Salmonella typhi. Whatwas the most likely source of his infection? *
1 point
A mother brings her 18-month-old son to your office. She was called by her day care center who reported he had vomited twice during the morning and had diarrhea as well She noted he had a slight fever the past 2 days and had not been very hungry. The most likely cause of his illness is : *
1 point
n July, you are called to a rural nursing home where several of the residents have developed a gastrointestinal disease consisting of fever, vomiting, and bloody stool. Lab analysis of the stool shows the presence of PMNs and Gram-negative rods. Epidemiological discussions with the residents indicate they all shared the same raw milk brought to one resident by his farmer son. The most likely cause of the infection is *
1 point
 After a trip to Peru to adopt a 6-month-oldbaby, a 32-year-old woman and her new baby both develop profuse, watery diarrhea with flecks of mucus. Both are hospitalized because of the severity and rapidity of the dehydration ,but neither one is febrile. What is the most likely causative agent? *
1 point
There is an outbreak of watery diarrhea in six members of a party of 20 who ate at a Chinese restaurant the day before. Fried rice is implicated. What is the most likely causative agent? *
1 point
Two physicians traveling in Central America develop what they self-diagnose as ET Escherichia coli. What is responsible for the fluid and electrolyte disruption? *
1 point
A 26-year-old woman presents with high fever, painful and frequent urination, and left flank pain. The isolate is a Gram-negative ,rod-shaped, facultative anaerobe that isoxidase-negative and ferments both glucose and lactose. From these data, what genus is most likely? *
1 point
A 6-month-old child has had watery diarrhea for 6 days. The stools have no blood and no pus. The causative agent has double-stranded RNA as genetic material . Which of the following is the most likely causative agent? *
1 point
A 15-year-old boy on antibiotics to clear up a community-acquired methicillin-resistant Staphylococcus aureus has clindamycin added to his treatment regimen to slow the production of the various toxins including Panton-Valentine leukocidin. He recovers but develops Clostridium difficile diarrhea. Why does C. difficile cause diarrhea? *
1 point
A patient presents with explosive, watery ,non inflammatory diarrhea along with headache, abdominal cramps, nausea, vomiting ,and fever. Symptoms began the day after eating raw oysters in August. What is the most likely causative agent? *
1 point
 All Shigellae have some invasive capability limited to mucosa of the ileum and colon, but some Shigella dysenteriae strains cause more severe disease. Why? *
1 point
Your patient presents with recurring pain suggestive of a duodenal ulcer and is positive for antibodies against Helicobacter pylori. What allowed H. pylori to survive the transit through the gastric lumen to start the infection? *
1 point
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