I think they probably got the infection during incubation, not from the hens. FWIW, the only time I have chicks die from yolk sac infections is when I hatch them in the incubator. Have you read this https://www.backyardchickens.com/a/mushy-chick-disease-yolk-sack-infection-omphalitis ?
-Kathy
Edited to add: not saying that they didn't get the bacteria from the hens, just that that hasn't been my experience.
-Kathy
Edited to add: not saying that they didn't get the bacteria from the hens, just that that hasn't been my experience.
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