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So Jody this is a case of "It may be a carrier or it may not be"?
Vaccinated birds cannot be carriers? I know it's a dead virus that
is used to vaccinate them.
Unvaccinated birds, if they have ever been exposed to it, can be carriers. Mareks is everywhere in the outdoor environment. It's worldwide. It can be carried onto the property by wild birds, on people's clothes or even the wind. It can be in the soil. It is one of the most common poultry diseases in the world. Chickens become infected and the virus lives in their body. The disease may never manifest itself, but can still be shed in the dander. If a bird is properly vaccinated and quarantined until full immunity is reached, the virus cannot live in it's system so it will not be a carrier and will not shed the virus. The vaccine is not the actual marek's virus. It's a virus that is similar enough to create immunity. Like all vaccines, it's not 100% effective. Most failures happen because strict quarantine protocals weren't followed.