The Chicken and Egg Problem

Bird Flu Epidemic: Where Have Outbreaks Been Detected?
https://www.cnet.com/science/bird-flu-epidemic-where-have-outbreaks-been-detected/

US egg factory roasts alive 5.3m chickens in avian flu cull – then fires almost every worker
https://www.theguardian.com/science/2022/apr/28/egg-factory-avian-flu-chickens-culled-workers-fired-iowa