combined usmle step 3: uworld practice test 2:, USMLE Step3 UWSA2 Notes, UWSA#2Questions and Answers (2025/2026)

combined usmle step 3: uworld practice test 2:, USMLE Step3 UWSA2 Notes, UWSA#2Questions and Answers (2025/2026) 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? *giardia lamblia* -greasy, foul-smelling diarrhea, bloating, flatus/belching, weight loss -transmitted thru *fecal-oral route* or thru *contaminated food or water*