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Quote: Yes, I vaccinate my chicks. It's easy and inexpensive. It comes in 1000 dose bottles, but the stuff is so cheap that I don't mind using a little and disposing of the rest.

Quote: There is more than one form of Marek's. The paralysis type is the only one that the vaccine protects against. Old timers used to call it Range Paralysis. It can cause anything from weakness to paralysis. It's incuarable. It can cause paralysis in the legs, wings and neck...

Quote: Marek's is everywhere. However, if you have never had a problem and like using your broodies, I would still do it. There will always be the threat of Marek's though. An old timer once told me, "If you have chickens long enough, sooner or later you will encounter Marek's" It is...

Chicks that are vaccinated and not quarantined are more of a threat to spread the disease than unvaccinated chicks because they may have partial immunity. They may have enough protection to prevent the symptoms but are capable of being infected with the virus. Granted unvaccinated birds can...

Quote: Were they vaccinated as chicks before they were exposed to the outdoors or other birds? Were they strictly quarantined for at least 10 days after vaccination? ETA: The vaccine has a 95% effectiveness if the chicks are properly vaccinated and quarantined. If it was done right, they...

Marek's can be contracted at any age. It's just more likely to manifest itself at that age. The rest of your flock are carriers. Most unvaccinated birds are carriers whether or nor they have ever had symptoms manifest themselves. You may have a virulent strain because you had an outbreak. I...