While CWD was first identified in the holding pens in Fort Collins, the epicenter was later determined to be further north in Wyoming. The problem with feeding deer is not the spreading of human diseases but spreading the CWD between deer. The pens in Fort Collins were cleared and disinfected. Deer that tested free of CWD were put into the same pens and they later tested to have CWD. It was in the soil and it can't be removed by simply disinfecting.