Quality control strains (standard strains) are well-characterized microorganisms with defined susceptibility or resistance profiles to the antimicrobial agent(s) tested. QC strains are also used to monitor the test procedure and quality control of culture media & reagents. They are available in the freeze-dried form in glass ampoules or as sticks or swabs that contain a dried form of the microorganism. Creative Biolabs can provide different kinds and specifications of QC strains, including customized products, welcome to contact us for product details and quotations.