cocci vaccine and medicated starter

[AccidentalFarm]

I just read that you are not supposed to use medicated starter on chicks that have been vaccinated. I've fed mine purnina's med starter for 2 days and i know that they have had the cocci vaccine. I'll be picking up a non-medicated starter today to switch to. My question is: How much damage have I done? My hens are 5 weeks old and have not been on the medicated feed previously, just the last 2 days.

Thx

 

[kstaven]

Best odds are you have done no damage. Over a longer term you could have really overloaded their little immune systems. I always thought that hatcheries need to include a note with vaccinated chicks "Do not use medicated feed"