Which patient scenario best supports a diagnosis of gastroenteritis given the abdominal symptoms described?

• A. The 54-year-old man with three days of cramps and diarrhea and soft abdomen.
• B. The 66-year-old woman with shingles.
• C. The 80-year-old man with MRSA foot infection.
• D. The 34-year-old man with naproxen-induced reaction.

Answer: (A)

Gastroenteritis presents with inflammation of the stomach and intestines leading to crampy abdominal pain and diarrhea, often with a soft, non-tender or minimally tender abdomen and no signs of peritoneal irritation. The scenario described as the patient with three days of cramps and diarrhea fits this pattern: acute onset, diarrhea as a prominent symptom, and a soft abdomen on exam, which is typical of a GI tract inflammatory process rather than a localized or non-GI issue.

The shingles case would involve a painful, localized vesicular rash along a dermatomal distribution, not primarily diarrhea or diffuse abdominal cramps. A MRSA foot infection is a localized skin infection with no GI symptoms to explain diarrhea. A naproxen-induced reaction could cause GI irritation or peptic symptoms, but diarrhea is not the hallmark feature here, and NSAID-related pain would more likely localize to the upper abdomen or present as gastritis or ulceration rather than a pan-GI inflammatory picture with prominent diarrhea.