Puritan Transport Medium (UTM) transport systems are stable at room temperature (RT) and designed for collection, transport, maintenance and freeze storage of viruses, chlamydia, mycoplasma, and ureaplasma. Leakproof cap is self-centering—it securely attaches the swab's handle to the cap when closing, providing easy removal and disposal of swab once the sample is at the lab. High-performance swab tip features your choice of PurFlock Ultra or medical-grade, spun-on polyester.