USMLE Step 3: UWORLD Practice Test 2 With Questions and Answers All Are Correct Test

USMLE Step 3: UWORLD Practice Test 2 With Questions and Answers All Are Correct Test 3 yo M has a 8 day hx of 3-4 daily episodes of soft, *foul-smelling diarrhea*. Increased belching & Flatus, decreased appetite but drinks liquids without difficulty. 6 yr old sister has same sx. Fam went on cruise to Mexico last month so he tried new foods and went swimming at beach&in cruise ship pool. Went on wkd camping trip 3 wks ago and ate the fresh fish. After vacation, he went back to reg diet fruits, veggies 7 meats. P 108, hyperactive bowel sounds. negative stool occult blood. CAUSE of sx? Correct Answer: *giardia lamblia* -greasy, foul-smelling diarrhea, bloating, flatus/belching, weight loss -transmitted thru *fecal-oral route* or thru *contaminated food or water* -ingestion of unfiltered water while *camping* or hiking --drinking, swimming or consuming food from contaminated water -sx DON't present ASAP b/c takes time for cysts to mature into trophozoites in host intestines -tx: *metronidazole* norovirus Correct Answer: -causes viral gastroenteritis -*cruise-ship* outbreaks -BRIEF duration: resolves within days -*VOMITING more common*rota rotavirus Correct Answer: *watery diarrhea* in kids age 2 and under -within 1-2 DAYS of exposure -also emesis, abd pain