Which infection presents with diarrhea, nausea, and vomiting, often due to contaminated food or water, and is described as not contagious?

• A. Gastroenteritis
• B. Gastrointestinal bleed
• C. Pelvic inflammatory disease
• D. Urinary tract infection

Answer: (A)

The main thing this question tests is recognizing a gastrointestinal infection presenting with vomiting and diarrhea after exposure to potentially contaminated food or water. Gastroenteritis is inflammation of the stomach and intestines, which disrupts normal absorption and triggers secretions and motility that cause both diarrhea and vomiting. The exposure to contaminated food or water fits the typical source of this infection, and the clinical picture is the hallmark of an GI tract inflammation rather than a problem from the urinary system or reproductive tract.

If you compare the other options, they don’t match the symptom pattern: a GI bleed would usually involve vomiting blood or seeing blood in stool and isn’t defined by the combination of diarrhea and vomiting from a contaminated-food source; pelvic inflammatory disease presents with pelvic pain and gynecologic symptoms rather than prominent GI symptoms after food or water exposure; a urinary tract infection centers on dysuria, frequency, and sometimes suprapubic pain, not this diarrhea-and-vomiting cluster.

So, gastroenteritis best explains the set of symptoms described.