I've had hens for the last five years with no issues other than the occasional predator. Last summer I found a poultry shop near me that offered started pullets. I purchased several only to fine them dying off. They seemed to have a respiratory illness (coughing, sneezing, hoarseness). They illness spread to the established flock and by winter I was left with only five of the new birds. I got rid of them and the coop has been empty since. I would like to start over with chicks, but am concerned that he illness may still be present in the coop and run. Can anybody tell me if that is likely? Would scrubbing the coop with bleach do the trick? What about the surrounding area/run? I appreciate any help!