My Kitten Oreo has it. I got her in Nov from my Brother. The kitten he kept has it worse then her. You cn not tell Oreo has it anymore. My brother did not know if they would live at first. They were born Aug 29 and went flat in Sept. Oreo was the Runt and was half the size of the others. She is over 5 Pounds now and is normal size. Part of teh reason I picked her is because she has Fcks. I wated to save a Cat with problems.