Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
Feline urologic syndrome (FUS) can be defined as dysuria and hematuria in cats of both sexes. The disease can be manifested by the following syndromes: 1) cystitis, 2) urethritis, 3) urethral plugs composed of mucoprotein, 4) mineral calculi, 5) urethral obstruction. FUS is estimated to affect approximately 1% of the cat population of the united states, accounting for up to 10% of the total number of male cats seen in veterinary practice.
Hanson, Paula R. and Morrison, Wallace B.
"Feline Urologic Syndrome in the Male Cat,"
Iowa State University Veterinarian: Vol. 46
, Article 2.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol46/iss1/2