Excellent post. The Marek's vaccine does NOT prevent them from contracting it, only from showing symptoms (this is true of most poultry vaccines, they don't work like human or dog vaccines). It is also totally ineffective to vaccinate them any time after 24 hours of hatching.
Vaccinating birds for a backyard, hobby, or self sustaining flock makes zero sense once facts are understood.
I had the NPIP State Veterinarian out here this morning for testing and we had several conversations , and he still stands by the same information as does Cynthia Smith, another Washington Sate Vet, and she is very active in poultry raising.
There is always time to vaccinate.
Despite my neighbor's birds (all of them in their entire flock) coming down with Marek's, mine have not, I have not ever lost a bird to Marek's.
We also vaccinate for ILT which is becoming prevalent here in western Washington....
And back to the state Veterinarian, yes we are doing great, vaccinate day olds, or when ever you can, especially a new bird you are bringing into your flocks.
The testing for Marek's on a live bird is extremely difficult as most diagnosis revilves around the many tumors that form internally.and it can take months and months before the bird developes external physical symptoms you can actually see: especially in gaite or behaviour.
This is why, once these outward behaviours are seen, the bird needs to be culled, but understand it has had the virus for months previous to these outward symptoms.
The virus can be shed in feather follicles....so during the time the bird 'gets' it, and the time you finally 'see' symptoms (stumbling, failure to fly up & roost, ec) the bird has thus shed millions of feather follicles...............
Who was it here that just had this very thing happen......@ochochicas ...........................she can tell you exactly what happens with a Marek's outbreak...she just went through it, and it took a long long time.
Incidently, the state vet here today also mentioned that the virus can stay in the soils for a very long time, so long after your last bird has died of Marek's....the virus is in the soil waiting.
Wether the home vaccine is sufficient or superior to the hatchery vaccine remains debatible..............some are 'made' with ova and some are not, and some seem to work better than others regardless of the manufacturer (at this time)
Years past we were always told the big hatcherys had the best vaccine, so now they say maybe not true.
So I vaccinate, I could not bear to have all my fowl begin the slow obviously painful death that Marek's would bring, not to mention their lineage lost, and the soil thus contaminated.
So building up their immunal systems (as much as we can) to this prominant virus is the best I (we) can do to eliminate it and protect the birds we love.