Simple to use and media-free. The patented polyurethane swab utilizes a special polyurethane open-celled structure that protects and releases organisms from their own environment. Like a sponge, the open pores pick up the organisms from their environment and protect them in a state of homeostasis during transport. The medium-free nature of the system prevents specimen dilution and nonviable organisms that can be present with devices containing transport media. Clinical studies have shown CultureSwab EZ swabs provide excellent recovery of clinically relevant aerobic bacteria up to 48 hours after collection.