About 4 weeks ago I bought several new chickens and quarantined them. I immediately noticed sneezing and coughing. (Yes, I should have been more careful before even bringing them home.) I had them for less than 48 hours before I decided that they were diseased and didn't want to risk the whole flock. I'd read that Mycoplasmosis never really goes away and the birds just become carriers, so I sadly culled these new birds. I don't know that it was Mycoplasmosis, I'm just guessing. Now my question is: what to do about the pen they were in? I want to use that pen, but I'm afraid that the bacteria is still lurking about, just waiting to attack my flock. Since it was a respiratory thing I'm also afraid to clean it out and stir up the dust that might have the germs. Is there a length of time after which the Mycoplasmosis (or whatever the respiratory thing was) is no longer viable on the bedding and feeder and waterer they used?