I have a flock of 9 RIR and 3 Red Sex Link hens that my husband and I share with his parents. We originally had the RIRs, and about a month ago I came home and my father-in-law had brought home the sex link hens to replace some we had lost to preadtors. He had already put them in with the others, so we couldn't really quarantine them. They are debeaked, so when I first noticed them sneezing I thought it was because they have to put their nose down into the feed to eat. They seem healthy and just sneeze occasionally, and have stayed the same all this time. In the last week I have noticed that pretty much all of the hens are sneezing and some make a sort of rattling sound, but they all seem to be acting normal in every other way. What should I do? Is there something I should give them? I am concerned about withdrawl times because we have regular egg customers and it would be bad to not be able to get them their eggs. I know there are lots of other sneezing chicken posts, but I was not finding enough info. Thanks so much for your advise!