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The vaccines are not live chicken virus.. they are usually a turkey version or something to that effect. See the vaccine section in the following article.. if you've never read or seen it yet.. it's informative...

The key is that none which are vaccinated are exposed to outdoors or adult chickens (dander/dust) for at least that 2 weeks.. but virus free vaccinated (or not) birds hatched from the same flock may be mixed together without issue. The vaccine does not spread the virus or prevent it but just...