A) Gastric mucosa with edema, erythema, and mucopurulent exudate. B) Retrograde view of the stomach showing oozing hemorrhage. C) Open edematous pylorus covered with mucopurulent exudate and blood flecks. D) Duodenum with friable edematous folds and mucosa, with erosions covered with mucopurulent exudate and blood flecks.