Attention to hygiene can prevent aspergilla numbers building up to point where problems occur this needs to be done in all stages to the end brooder stage
Eggs should be fumigated and / or washed in a recognized egg sanitizer used according to directions
The cold storage room the incubator and the hasher should be fumigated or cleaned regularly with a recognized disinfectant active against fungi
The brooder house should be cleaned and disinfected before the hatching season begins. If individual pens are cleaned out during the breeding season they should be disinfected.