On the eleventh day of ID Christmas, in patient histories, eleven sounds a weeping, 10 courses completing, 9 pipettes piping, 8 livestock exposures, 7 Vibrio swimming, 6 chest x-raying, 5 golden Staph, 4 shedding birds, 3 gram stains, 2 vials of vanco, and E. coli in a petri.