Ceragenix Pharmaceuticals Inc. said its CeraShield coated silicone urinary catheters used in preclinical tests were able to provide complete protection against E.coli bacterial colonization for the entire duration of a 21–day study. The results of the study, which also examined two leading silver-coated urinary catheters and one nitrofurazone-eluting catheter in the same protocol, reflected that all three of the compared catheters lost antimicrobial activity after three days.