if you decide to go with only vaccinated chick's from now on, they need to be kept from exposure for three weeks after the vaccination is given.Someone here pointed out that without FF, my flock could have been sicker than they have been. I'm counting on FF to give them nearly normal, healthy lives in spite of being infected with a terrible disease.
The lab just called and confirmed the diagnosis of lymphoid leucosis, a form of avian leukemia. It's not Marek's, but it's still viral and contagious. Izzy, my rooster whose corpse I sent to have the necropsy done, had a liver so full of tumors it weighed two pounds! His mama has the disease and passed it to him through the yolk of his egg. His daddy probably succumbed to the bone form of the disease. At the time, I thought he had broken his leg, but he was more likely to have become lame from a bone tumor. Instead of healing, Penrod became sicker and sicker, probably because tumors were taking over his organs as well.
I just got off the phone with my friend who has chicks that spent a few weeks in with my flock before I turned them over to him. He took it better than I thought he would when I told him his flock was also infected and a few of them may become sick in the years to come. This is a very contagious disease, laterally infecting chickens through fecal and dander contact.
Looking back over the years, recalling the various chickens in my flock that have become ill and died, I can see the various manifestations of the disease, which was likely present in the very first adult hens I adopted. One died suddenly overnight, falling dead off her perch, probably because of enlarged organs. Another had to be euthanized because she had become so lame she could no longer stand or walk. She probably had what made Penrod lame.
So, I've had to accept that this is the flock I've been dealt. I'll give them the best care I can and hope for mostly normal lives for them with the help of FF.
Don't worry, it's not the end of the world. I once saw a thread about having a flock with marek's in the emergency and disease section. It was called something like "not an emergency" and also had "marek's" in the title.