Vaccinate your chickens?

[Lenny loves chickens]

How many of you vaccinate your chickens? How old and why.

I am trying to decide if I should vaccinate my chickens. They are were 6 months on thursday

 

[WIchickMama]

Only thing mine have received is vaccinated for Marek's from the hatchery

 

[Aquira]

I'm pretty sure they have to be vaccinated within a couple days of being born

 

[Lenny loves chickens]

I got mine from thiesens. They arent anything fancy and are not very helpful so I am not sure cause they were there at like a day old. I dont think they are vaccinated