A 75 yr old male presented with h/o of episodes of vomiting and fever

A 75 yr old male presented with h/o of episodes of vomiting and fever with a temp of 99-101f since two days he also complained of abdominal pain in the upper quadrant i.e both epigastric and umblical he had a past history of grade A oesophagitis , gastric ulcers and pangastritis and he was diagnosed with stroke and is on regular medications what r the possible differential

PUD, Viral Gastroenteritis- causing Vomitting, hepatic/ pancreatic abscess

Cause of fever ?? Without features of abscess