Well of course you have to hatch, if only to see for yourself what they look like 

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Thank you, to tell you the truth I am kinda of glad. I am glad I didn’t spend a lot of money on birds and then have this happen.I'm sorry, Kara. I've had only two completely sudden deaths of fairly young birds, one was Atlas's sister, Robin, and the other was Suede and Caroline's daughter, Glenda, who was two years old. I think Robin choked (she always gagged on scratch and I heard her doing it a few minutes before I found her) and I think Glenda's was an accident at roost time, but not really sure.
I've always thought of both Silkies and Polish as weak birds in general. Not sure that has any bearing on this, of course. My issue with a vaccine is that, because it does not prevent the disease, but only masks it, how would someone know they have Mareks birds? Seems logical to me that you could have carriers and be unaware, at least for a very long time.
The lab report still bugs me. The line here: And basically, this is the same as the last paper you had. I don't see anything about tissue testing on the report. They are going on visual findings and general age and condition and absence of anything to disprove Mareks, etc, it seems to me, unless I am just not seeing it.
I'm really sorry, Julie.
ETA: Oh, I did see this, so this says they did look at tissues, I was incorrect:
thank you,h2o, first off, let me say I'm sorry for the loss of your bird. I'm sorry the result was Mareks in your bird. Please, don't let that information bother you too much, and don't take it as a reflection on your flock keeping methods.
On one of the threads I frequent, 2 people have confirmed Mareks in their flocks. They've closed their flocks, and have carried on. They've done surprisingly well. In one flock, the initial devastation took a serious toll as it swept through the flock, but then subsided, and it's not as common for the to experience a loss now. Hatched chicks, seem to do pretty good so far. IF they continue breeding the way they're doing, their flock should attain partial to total resistance within the next generation, or two at least to the strain they're exposed to.
With the second person, it went through their flock much more slowly. They experience losses here, and there, but nothing major. Possibly a different strain. They too closed their flock, and have carried on. The chicks seem to do fine in that flock too.
Both flocks experience a loss once in a great while, but nothing like when it hit the first flock I mentioned. Both people are very strict with their biosecurity practices, not wanting to contaminate anyone else's flock. They still enjoy their chickens, and are saddened when the suffer the occasional loss.
Once they got over the initial devastation, they realized that starting over is not necessarily a viable option either, since soil decontamination can take years, and be expensive. There's no guarantee against contamination, or recontamination when going that route either. Another problem, they don't know the source of their contamination. Was it a wild bird that flew from a nearby contaminated farm? Was it from a tiny piece of dander they got from looking at vaccinated chicks at the feed store? They don't know where it came from.
The reason I'm totally against the vaccine is, as I stated before, it's a misnomer to call it a vaccine. We associate the word vaccine with protection against something. The Mareks vaccine offers very little, to no protection at all. It gives a completely false sense of security, and has been blamed for the spread, and mutation of the original strain of Mareks virus into the 5 additional strains we have now. It's actually better at this point, to try breeding for resistance, instead of vaccinating. At least they would eventually develop some immunity to the type of Mareks they've been exposed to, and possibly have some immunity to the other strains as well.
Thank you, to tell you the truth I am kinda of glad. I am glad I didn’t spend a lot of money on birds and then have this happen.
I need to call them and ask if if their findings rule out the other disease that looks very similar. I assume it does from this report.
The leukocyte sounding one.