Thanks for the tag,
@Bkaye.
@Slicker chicker I'm so sorry. Marek's sux. The end.
But hope is not lost, that is the good news. Your history sounds pretty much a carbon copy of every post anyone has ever made about their experience with the disease. Their birds die, a lot of birds and they aren't knowing what to do or where to turn. And just when you think the worst is over, BAM! A bird ups and dies under mysterious conditions.
At one point in time I too lost approximately 2/3rds of my flock to Marek's when the disease was at it's height as far as losses were concerned.
The good news is that it does get better.
@Debbie292d posted a link to my article (BTW, Thank you Debbie, your kind words are much appreciated) and I do invite you to read it.
Concerning my opinion of vaccinating. It's the only safe way for me to bring birds into my flock. I recently read an article on one of the hatchery sites that said if you don't have Marek's on your property not to vaccinate and they gave the impression that if you did it would introduce the disease to your coop as the vaccinated birds can and do spread the virus through their dander even though they are vaccinated.. Hmmmmm. Food for thought but, how do you know if you have the disease if you have never had chickens before? I didn't know but it sure as heck was there and I began losing birds when they were 14 months old to it. Had I known before hand I sure would have vaccinated. But you see my point. Better to vaccinate than not because you never know what is in your area, Marek's wise.
Every bird I've added to my flock is vaccinated. Every future bird I bring in will be vaccinated. After going over 5 years without a death that I could point a finger at and say, Marek's disease, I lost a young cockerel last month under suspicious circumstances. Healthy a month earlier, then suddenly found him knocking on death's door, emaciated, lethargic, feathers fluffed. I tried worming him but no response. When he hadn't moved out of a nesting box for 24 hours, I put him down. No outwards signs of disease, no tumor growth, just failure to thrive and dead.
It hit me hard. The killer in the shadows is still around. My big question at this time is why did this happen? Why this bird? He was from vaccinated stock crossed with resistant Amish barnyard crosses. 4th generation. I had hatched him myself last spring, hand raised him. I have read where the hen passes on immunity to the chick. If the hen is resistant, so will the chicks be. If the hen is vaccinated, the chick will be resistant through the hen once again. My question now is how many generations does this immunity last before it becomes diluted? Genetics are not my strong suit. I'm more of an observer. But this has me curious and I am now watching my 4th generation carefully especially since I lost a few hens this past summer and fall to what I suspect is non Marek's related sudden cardiac death....or is it Marek's related once again? Cardiac involvement is well documented with MD. Has my flocks' resistance reached its limit? Time will tell.
One thing I will stress is don't give up. This year I am adding some White Leghorn pullets to my flock. They will be vaccinated. I'm hoping to cross them with my Egyptian Fayoumi roosters next year and see if they will pick up any genetic immunity from them. My bantam breeding is on hold until I can add some fresh birds to the gene pool, since the birds I lost this past year under suspicious circumstances were bantams and bantam barnyard crosses. Since my barnyard crosses have proven resistance I suspect my weakness is coming from my vaccinated breeding stock which is now 6 years of age and younger. So is the loss of resistance coming from the vaccinated bantams?
Even if so, 5 years is a good long run without any suspicious deaths. So yeah, vaccinated birds rock, IMHO. Vaccinating isn't perfect. You can lose vaccinated birds to the disease but it sure levels the playing field in your favor so you can at least keep and enjoy a backyard flock.