Why do chickens need to be disinfected frequently?

Chickens know that disinfection can be said to be the top priority of chickens. It runs through the entire breeding cycle of the chickens and even outside the breeding cycle. Some breeders do not know much about disinfection work. Disinfection is just like routine work. It is not put into the heart. This naturally has no effect. Disinfection is equal to no disinfection. Some people don't even pay attention to disinfection, which is the root cause of profit and scale.