You can get e-coli and samonella and giardia and c
occidiosis and avain flu (more of a problem in China than here but since wild birds migrate...well, thats what ag always checks for, also there are thoughs that avian flu has led to swine flu etc. you could spend all day reading about that but its really not a concern unless you are in rural china or mexico and it CAN jump to people, but not often)...some people get lung issues from all the dander and dust (I forget the name-I seem to be immune after all these years LOL) ABSOLUTELY be RELIGIOUS about handwashing. DO NOT KEEP THEM IN THE HOUSE but for more than a few days at best-they make ammonia at an alarming rate esp. after they start growing, unless you are super super SUPER clean and change them several times a day. Best to keep them in a barn or brooder room or even a garage if in the city. Do not bring poopy eggs in the house without having a place to tend to them and then cleaning the area) The good news is You can have the sickest snottiest coughing about to die bird and you cannot catch anything from it-it usually has some sort of funk like infectious coryza. DO NOT LET KIDS or anyone without a build up of immunitiy to farm life (city folks, elderly, young children-handle them...very easy for them to pick up e-coli or samonella-happens all the time out here when the city folk come to the petting zoos at the fairs etc. It only takes rubbing your eyes nose or mouth or having non bandaided cuts to pick up something so WASH WASH WASH the hands-be obsessive compulsive about hand washing when youre done playing and you will have no problems. Ive been up to here in all kinds of animal and chicken poop for almost 40

plus years and never caught a thing.
Pigs tho, FYI, can catch human flu!
No peeping is a sign of contentment or could be sign they are too hot-are they staying away from the heat area??. Some peeping is normal with awake or startled and just being normal chickens. Lots of LOUD peeping (and clumping) means they are too cold. Be kind to your chickies and keep the cats away from them and get the cats a fish bowl.