I could be mistaken, but I thought that the hatcheries vaccinated through the egg? Maybe that is just in the broiler bird hatcheries...
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Welcome to BYC...sorry you're having troubles.How much 250mg antibiotic should I give my 5 days old sick chick I am going to put it in her water
Welcome to BYC...sorry you're having troubles.
Oh, I see you have already found some help here:
https://www.backyardchickens.com/t/879915/chick-hock-infection-chick-is-on-the-mend/10#post_18215096