The pullorum incubation period is only 7-10 days so your bird could easily have contracted it after it came to your property and probably from area birds.The hatchery I got the chicken eggs from is npip certified. I get all of my eggs from that same hatchery.
In most states, testing for NPIP is only done annually, so their birds could have contracted it since their last blood test. It is transmissible from hen to chick through eggs.
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