Quail and chicken keeping

Hi everyone, I was at my local pet shop and found they now supply little button quail so I came home and started to do some research. I found that quail carry many diseases that are fatal to chickens. Could someone please tell me if the diseases etc carried by quail are airborne? Or can they be spread by human contact (feeding my quail then chickens or vice versa)? I would like to keep some quail but I have some very expensive roosters and hens that are show quality that I don't want to risk.

Thankyou, Jesse