You are doing home visits and stumble upon this scene. The patient admits to doing IM shots of street drugs. "But it's cool, I clean the needle before I inject." You ask him how he cleans the needle and he says, "I lick it." Unfortunately, he has an erythematous tender area over his deltoid where he injects. "I think I might have an infection," he says. You admit him to the hospital and get an ultrasound which shows a complex fluid collection. Aspiration shows gram negative rods. Unfortunately at that time, he says, "I want to leave. I'm not going to stay. Just give me some oral antibiotics."
Challenge: What is the antibiotic of choice here? What might the organism be?
Image is in the public domain, from Wikipedia.