I just bought 4 one week old chicks who were vaccinated for mareks. My brooder has 9 chicks who are 2 weeks old and not vaccinated. The brooder top is not very high, and 3 jumped over, right into the pen that has the new vaccinated chicks in it. I am terrified and I have no clue what to do. I did not think I could mix them together. Is this as bad as I think it is? will my 3 non vaccinated chicks now be infected? Where should I keep them? put them back where they belong? or leave them where they ended up? I know this is all due to my error and I am so mad at myself. Is there any hope?