Detection of objectionable organisms
Start with the big picture
Objectionable-organism testing complements total microbial enumeration with targeted methods informed by product and patient risk. Evaluation considers factors such as water activity, pH, preservatives, route of administration, and manufacturing environment. Sampling and handling matter: composite samples require aseptic transfer, and preserved products may need neutralizers to reduce false-negative results. Enumeration methods establish a baseline, while selective enrichment and differential media help detect specified organisms. Suspect colonies require confirmation, and acceptance criteria depend on the product and applicable monograph; specified pathogens may have zero-tolerance criteria. Special procedures can address organisms such as Burkholderia cepacia complex in certain aqueous preparations, as well as anaerobes or spore formers when relevant.
What you'll learn
- Define bioburden and explain what makes an organism objectionable.
- Identify product and patient factors that inform microbial risk evaluation.
- Describe the roles of sampling, enumeration, enrichment, and selective media.
- Recognize how confirmation and product-specific acceptance criteria guide decisions.
Continue your study
Work through the complete notes and reinforce the topic with the study tools available in the full lesson.
