I think my 2yson put raw chicken in his mouth. He didnt eat it but said: not good. I'm afraid he will get sick. Anything I can do to prevent illness?

Not really. It is amazing how most babies are not constantly sick as often as they put their hands/fingers in their mouth. Sometimes raw chicken can be tainted by the e.coli or salmonella, germs that may not be washed off or removed during processing. After baby puts them in their mouth, you just wait to see if baby develops fever or bad diarrhea, if so they need to be seen. You stop this before they are expos.