serratia marcescens is a species of rod-d gram-negative bacteria.

abstract agar anaerobe antibiotic background bacteria bacterial bacterium biology biotechnology blood care cell chemical closeup colony color culture disease dish drug education enterobacteriaceae experiment gram grow growth health infection lab laboratory macro marcescens media medical medicine medium meningitis microbial microbiology mixed negative opportunistic pattern petri pigment plate pure red research rod science scientific selective serratia shaped shiny smooth study test texture white