concerned about vaccination

[tnmommy]

I am not sure if my chickens were vaccinated for Mareks. So, could I be introducing the disease into my existing flock by vaccinating the new chicks? I know I need to vaccinate against avian pox because the older flock has already had that.
Any other vaccines I should worry about?

 

[fried green eggs]

Putting vaccinated pullets in with existing ones will not give the older ones Mareks. Chicks vaccinated for Mareks must be kept in area free of the field type of Mareks for at least 14 days to be protected but, they don't become carriers from the vaccine. Mareks can be spread by dust on clothing, shoes, feed containers etc... Wild birds are carriers and if, you have had Mareks in your flock before - your other birds have built up resistance and they may be carriers.