Microbiological Test System

What is a Biological Indicator?

Chapter 55 of the USP is titled “Biological Indicators – Resistance Performance Tests”.  Within the introduction, a definition of biological indicators is provided:  “A biological indicator (BI) is a well-characterized preparation of a specific microorganism with a known resistance to a specific sterilization process.”  To expand on this definition, a BI is essentially a microbiological…