Routine blood cultures are drawn on an otherwise healthy 20 year old man enrolled in a research study. Cultures are drawn from 2 sites on different arms. The culture from the left arm is negative. The culture from the right arm shows the above image after 72 hours. The study subject does not have fever, hypotension, leukocytosis, or any other detectable laboratory abnormalities.
Challenge: What antibiotic (or class of antibiotic) would you prescribe?
1. What is the organism shown above?
Image shown under fair use.