Most Common Diseases in Flocks

[RoostersAreAwesome]

I would say Coccidiosis and Marek’s. Cocci just because I’ve seen so many threads on here about it, and Marek’s because it spreads so easily and can present in so many ways. I believe that many of the unknown deaths chicken keepers experience are due to Marek’s. There are so many different strains, some of which only kill a small amount of an infected flock. And with all the vaccinated birds out there, which can still carry and spread the disease, I believe it’s much more widespread than most think.