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Note the vaccine reduces the decline in egg production, not prevent the chickens getting the disease. https://pubmed.ncbi.nlm.nih.gov/9190024/

Were the birds vaccinated against Mycoplasma? We don't have the hatchery system in the UK or Europe for domestic fowl really. My view is it doesn't matter where you get chickens from quarantine is always the sensible option.

Very unfortunate, particulalry given you've been responsible and had lab tests done. It's a major problem here in the UK. Part of the problem is there may be absolutely no signs of ill health but the birds are carriers. One of the things that does bring a bird from asymptomatic to obviously sick...