I got day old vaccinated chicks. They lived in my house for 3-4 weeks. Then on my patio for 2 weeks. Then moved to a disinfected shed with LITTLE contact with Marek's carriers possibly on my shoes at 7 weeks. I'm trying to slowly introduce them to my Marek's exposed area. How long should I wait till I let them outside separated by a fence from my flock? Or with the flock? Anyone have successful integrations?