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Serratia Marcescens Essay Preview: Serratia Marcescens Report this essay Doctors must know which antibiotic kills each disease-causing bacterium. We, Chelsea and Justin, will find out how Erythromycin, Penicillin, and Ampicillin are affected by the bacteria Serratia marcescens. Our hypothesis is that Penicillin will have the largest ring of inhibition, the ring around the disk where.