Im new to chickens but I am trying my hardest to raise them properly. I recently gave a farmer a couple of mis-sexed roos for a 2 month old pullet. She was kept up in the backyard away from my flock for 2 days. She seemed like she was perfectly fine and oh, so sweet. I moved her to a little pen next to my main coop and she has been in there for about 10 days now. About 4 days ago I noticed that every now and then she would make something like a sneezing sound. That was it, no swelling, discharge, behavioral changes etc. Well, today I was working on the hen house and spent about 5 hours with all of the girls. I let the newbie free range with the other 5 birds thinking that with all of the space she would not be attacked because everyone would be busy looking for snacks. It worked out pretty well. BUT, I noticed that one of my big girls (4 months old) was doing something funny. When she wasnt eating or chasing the new chick she was standing around with her mouth open. I thought that she was just panting like a dog or something because of the heat. Well, now that the kids (and chicks) are in bed I have spent the last 2 hours reading the forum and freaking out. There are so many different illnesses and symptoms! I really need to know where to start. I am located in the South, where it has been very hot and humid. We have also had a lot of rain lately, so the ground has been moist. Ive got a 2 month old that sneezes and a 4 month old that stands with her mouth open. I think that it is called "gaping" but the definition for that includes the bird "extending" their neck out and she doesn't do that. She just stands there with her mouth open sometimes. Those are the only changes/symptoms that they have .everything else they do is completely normal. I was thinking about adding garlic to their breakfast and trying to locate some vetrx to rub on beaks and add to water. Is that a good start or do I need to do something drastic. I dont want to become neurotic and become a hypochondriac about every thing that the birds do that may seem abnormal, but I dont want to lose all of my birds to something serious. I appreciate your help and knowledge in advance with this situation.