Food stored under unsuitable conditions should not be purchased or used because of risk of spoilage.

He asked, how big is the minimal genome that will give me a functioning microorganism?

Food microbiology is the study of the microorganisms that inhabit, create, or contaminate food, including the study of microorganisms causing food spoilage.

This can include medical waste or samples of a microorganism, virus or toxin (from a biological source) that can affect human health.

A chemotype (sometimes chemovar) is a chemically distinct entity in a plant or microorganism, with differences in the composition of the secondary metabolites.

The assay is intended to be an indicator of fecal contamination more specifically of E. coli which is an indicator microorganism for other pathogens that may be present in feces.