Serratia

The FDA said the tests may be contaminated with bacteria such as enterococcus, enterobacter, klebsiella and serratia species and cause infection.

Bacterial lawns (often of Serratia marcescens ) are also used extensively when as an assay method when using bacteriophage as tracers in studies of groundwater flow.

Gammaproteobacteria are the largest subgroup which includes Acinetobacter, Pseudomonas, Escherichia, Salmonella, and Serratia species.