Yes, it does. Thank you!Marek's is ubiquitous and everybody should assume that their flock is exposed. It is carried by wild birds and it is everywhere, worldwide. Because one bird has the symptoms does not mean that all birds will get it. You may never see it again or you may have a bird here or there or then, a lot of them. There is not treatment. You can vaccinate chicks at one day old or any age but it will not guarantee immunity. Once on a premises, it will always be there. The virus is long lived (decades) and nothing kills the virus (not bleach, not oxine, not soap, etc.)
I would lose an average of one bird a year until year before last year, I had two birds come down with classic Marek's. First, they are unsteady on their feet. This slowly adavnces until they cannot stand at all. They are not in pain but then lose control of both legs completely and then their wings. They will get to where they cannot reach their food or water. When they lose total control of their legs, I usually mercifully end it. Year before last, however, both a pullet and cockerel came down with Marek's. Both reached the point they could not stand up and just when they were on their last day or two (separate times), BOTH stood up and just as gradually as they lost control of their legs, they just as gradually got control of them again. Both lived and thrived. The pullet started laying and the cockerel grew to size. btw, yes, I had the state lab confirm it was Marek's I was experiencing. It is true that a survivor will carry the virus -- but if it is there & everywhere anyway, carried on dust and dander, then what difference does it make? I had no losses to Marek's last year - none. I have been breeding from older birds so they are birds that have been exposed to marek's and it did not effect -- a natural immunity which I prefer. Everyone should assume they have Marek's.
I hope this helps you.