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I am not trying to argue with you! You have a lot of valid and very important points. I am just going to argue with this fact, because I see it parroted so often on articles, and I take issue with it....
I really have to argue with the logic that Marek's is "Everywhere". I used to think this because I see how easily it spreads, and most of the home-written articles I've read pretty much suggest that IT IS EVERYWHERE and every flock has been exposed, know it or not.
I really looked into this and I cannot believe this. Marek's virus, once taken in to the chicken's body, creates latency if the bird does not become symptomatic. This is what the herpesvirus does! It does it in people, it does it in animals, it does it in chickens, it does it in turkeys. Simply, if a chicken is exposed, they will either show symptoms, become a latent carrier, or both. Even if they never shed a single virus capsule (though they probably will at least once). So, if an exposed bird is tested, via DNA/PCR testing, it would show up as positive.
Why then, do people's birds/flocks show negative results sometimes?
It is not everywhere. It IS common! Heavens, yes! It is way too common! And it is so easily spread, yes! Much to our sadness!
But it is not "everywhere".
Knowingly using this logic to excuse the spread of this virus into otherwise unexposed birds is, frankly, unethical. Be it by apathy or simple ignorance, it is unethical. Period.
I know some people don't mind too much the loss of a bird here and there. And some people get lucky. Some people may get exposed birds and never have a problem, thus never a complain with the breeder. But the Marek's is now there. And maybe it wasn't before. So now they breed and sell, and sometimes their customers don't get so lucky. The cycle continues.
But some folks keep chickens as pets, at at the very least, very loved livestock. Selling or giving away Marek's exposed birds, knowingly, and without letting the new owners know is very low.
Now, if someone has an exposed flock and they are breeding, and let the customer know so that they make an informed choice ("I am getting a bird that has probably developed natural resistance, but might be able to spread this if I have unexposed birds"), that's fine. It may, as mentioned above, be to the benefit of backyard chicken keeping over the long term!!
But you know, after seeing birds go through this, I would never condone knowingly selling/giving away Mareks+ birds without educating a customer/adoptee beforehand. The *shrug* "It's everywhere anyhow" attitude sure gets my feathers in a ruffle.
Sorry for the rant! Really, this is not aimed at anyone here. Just today I discovered that someone said that they have long had an exposed flock and yet I see them selling/giving away birds. I cannot imagine knowingly giving this virus to anyone's flock. It seems cruel.