HydraFlock® swabs, PurFlock® Ultra swabs, Media Transport Systems. Puritan is a leader in flocked swab technology. Puritan’s swabs produce superior sample collection, rapid elution, and increased test sensitivity by combining a unique microstructure with innovative fibers proven to be more effective than older-style nylon products. Both the PurFlock® Ultra and HydraFlock® swabs are used in viral and bacterial transport systems and have been validated around the world with automated systems and manual laboratory testing practices. For more information: