Pretty interesting post and reminder about being careful with wet bedding. Very sad loss of chicks to aspergillosis.
Some one on here did post about cutting open a bird and dpseeing yellow stuff floating around inside the body cavity but I believe it was from internal laying not what Leah's mom posted.
If you are brooding chicks as long as you keep their bedding dry and they have good ventilation I wouldn't worry. I would think anyone brooding chicks this time of year would have them outside by now anyways since it's summer