Hi, I recently dug out all the yucky mud and straw and poo that was in my chickens run and put in about 6 inch deep of wood chips that had been in a pile in my garden for about a year. They had composted down to a lovely consistency. I also sprinkled liberally with sanitiser/ disinfectant. They loved it! This was about 2 weeks ago and now I have noticed that 2 or 3 of my hens seem to have the symptoms of aspergillosis. Gaping, snoring, lethargic and sleeping a lot. I put poultry tonic in their drink every day now and hope to see an improvement but I am worried that I may have caused this by putting in the wood chips. Is there anything I can do to purify the wood Chips? Or do I need to shovel it all out and start again? They were almost knee deep in mud over the winter and I was laying straw down on top of the mud again and again but that made it smelly when the mud and poo seeped through. Not very hygienic. I'm learning the hard way with my birds but I love them so much. I have 19 hens and 2 ducks in a fairly big enclosure, it took me all day to muck it out and lay the chips. I thought I was improving their living quarters. Any advice greatly received. Thank you. In the nest boxes I use left over hay from my horses.....could that be it? There is ventilation in the henhouse and not had this problem before so guessing it's the woodchips and spores?