Vaccinated chicken around one that wasn't vaccinated

[meadrian]

Can a 12 week old chicken (now 22 weeks) who's been vaccinated for Marek's at a day old contract Marek's if they were around a chicken who had it? She was around her for for about 8 weeks before the other one died. We thought she'd been vaccinated, but then found out the breeder had a problem and actually wasn't.

The one left (22 weeks old) was from a different breeder and seems very healthy. Just wondered if she could still contract it or be a carrier if she'd been vaccinated in the begining.

Thanks!

 

[wombat]

Yes, it is possible for a vaccinated bird to still contract Marek's.

Far less likely than for an unvaccinated bird, but it can occur.

edit: Vaccinated birds can also be carriers. The vaccination does not sterilize.