I didn’t find an article of ‘cold’ - like problems with chickens in the BYC -sickness articles.
But on the page link you find lots of info if you like to reed more. it might be from a commercial organisation. (?) So be cautious in believing what they say is the best to do...
Wow. That doesn’t look great at all.
Anyway. That is not the same as the ‘cold’ my chicks had. They where only sneezing. In a Dutch forum some people told me they needed antibiotics to cure. Others said you get weak chickens if I gave AB. I didn’t give AB and they all cured.
@Eggcessive...