Question: A 48-year-old man was referred to our hospital with a 12-hour history of acute massive upper gastrointestinal (GI) bleeding. He denied previous similar episodes or chronic medical illnesses. Two days before admission, he was seen in another hospital for acute febrile illness, for which he was given an empirical antibiotic in a form of clavulanted amoxicillin and oral paracetamol, and his fever subsided. On the day of admission, he developed severe hematemesis and hematochezia, but no bleeding from other sites.