I have a few questions regarding the nature of Disease's powers if you don't mind. 
Does it affect all living things? Animals, plants, etc? 
Is the effect immediate? Or does it take time? If it does, what is the gestation/incubation period for the illness to show symptoms/manifest itself?
Say the OC touches a cup, is he able to taint the water within the cup? Or must it be direct contact with human skin in order for illness to occur? Does things touched by him leave a 'taint' that might infect others that touch those things? Is it controllable?
Sorry for any inconveniences and thanks again for the quick reply.