Yes, disinfect the waterers by scrubbing with hot soapy water and finishing with an Oxine and water rinse, if you have it. You can also use Oxine mixed with water in a spray bottle to disinfect the rest of the premises, even misting the birds themselves. It is still not too late to do that. Oxine is great stuff, but if you don't have it or don't want to purchase it, at least use bleach. Oxine is ten times more effecive, though. My DS washes out the waterers with boiling water almost every day in the winter time; we think that helps, too. If you want to do something extra you can start the rest of the flock on Aviacharge, a good thing for them to be on through the winter, or use organic apple cider vinegar, 1 tbsp per gallon, which some say is a natural antibiotic and preventative. (I wouldn't use it to treat a sick chook, though). Turmeric can be bought in bulk and is supposed to be a preventative too, but I don;t like that stuff cause it makes them sneeze and it also stains.
