Didn’t know if this was a good place to ask this. So I bought the Mareks vaccination but as I’m sure you know it only lasts for an hour or two once you mix it. So I’m vaccinating chicks that are between 1-3 weeks. Is there harm in vaccinating at 3 weeks? Can Mareks be in the air and end up killing the chicks I vaccinate? I already think I established that unvaccinated chicks wouldn’t be affected by other chicks having been vaccinated. I’ve gotten chicks from different people and I’ve also hatched a bunch so I don’t know who is vaccinated and who isn’t...