I have been surprised to get a patient who was operated on his shoulder for rotator cuff repair, wound healed well, he was to be followed up after 6 weeks. he came back at 3 weeks, with a wound discharge and culture grew Citrobactor Koseri.
which is very unusual infective organism in shoulder wounds
it was sensitive to Co-amoxiclov and Ciprofloxacin. responded well to the treatment, but took many weeks.