We have 5 hens that free range in our backyard and 4 chicks, age 6 weeks, still inside our home. Yesterday, I received the necropsy report on one of our chicks, confirming Marek's as the cause of death. This is somewhat new to me, but my understanding is that the other chicks would have certainly contracted Marek's from the one that died. And while the chicks and hens have never had direct contact with each other, we have two dogs and two children who probably do a lot of tracking of dander between the two environments. I'm assuming this means the hens have probably been exposed, also.
Now I'm not certain how to proceed. Do I keep the chicks, under the assumption that everyone has been equally exposed and there is nothing I can do? Or do I cull them in the hopes of saving my hens from getting sick? If it matters any in the equation, I love my hens to pieces and would do whatever I could to improve their outcome.
Thank you for any feedback. I'm feeling pretty rotten about this "lesson learned" and hope it doesn't end up as badly as it seems it will :(