RNASE3 and bacterial urinary tract infection: The IFM images showing ECP expression on UPEC adhering to cultured epithelial cells and on intracellular E. coli in the mouse bladder urothelium and exfoliated bladder epithelial cells present in urine sediments from an UTI patient are intriguing and highly evocative of a role for ECP in the biology of this organism within the urinary tract of the host.