Technical Information Bulletin: Recovery Of Enumerated Microorganism Challenges On Selective Media Versus Non-Selective Media

MicroBioLogics Inc. is a manufacturer of microorganism preparations that serve as quality control challenges in clinical and industrial microbiology laboratories. A frustration that MBL and our customers often share is the apparent discrepancy between established mean assay value of a challenge microorganism preparation and the colony forming unit (CFU) recovery on selective media.

To better serve our customers, a brief discussion regarding the selectivity and recovery of assayed microorganism challenges on selective media will be informative and beneficial.