It did. I have only really used them as lock down incubators, because I currently live in a house that isn't climate controlled. The incubator has a hard time with wide temperature shifts. I'll have to see if moving to a house with HVAC in the next few months will change that.
I think this article would be more accurately titled "how to vaccinate your chickens for Marek's," since most of the information seems to be on vaccination. Also, this article uses "it's" when it should say "its." Well-written, however, with lots of good information on Marek's vaccination.