Also, unless it is a particularly hot strain of Marek's, usually only a portion of the flock will show symptoms at maturity. 1 out of 3 showing symptoms is not atypical, even though if he has it the others definitely do too. They just may not become symptomatic at this time.
ETA: For example, my dad had a flock of six pullets he raised from a young age. At POL 2 had to be culled due to classic Marek's symptoms (paralysis etc). The other 4 made it to around 2 years old then eventually died of secondary problems that they likely contracted due to a suppressed immune system caused by Marek's.
Thank you both!! Very interesting!! I didn’t realize that. So he’s at like the prime age now to get it? He’s 5 months old.
Does this mean Jack and Wilma could still get it too even though they seem fine now???
I think I would literally cry so much, harder than even for Red, if Jack got it. He’s the best boy ever and my favorite (don’t tell Red) so I’m not sure what I would do if he got it. Probably bawl
IMO it is not a matter of them "getting it". If Red has it, then they all have it. It is just a question of whether or not they will develop symptoms in the next month or two. They are at the age it commonly manifests. BUT it is not guaranteed. They may be fine for several more years. See my above post.