lawsuit against McDonalds?

You have a claim for negligence against McDonald's.  Prior to filing a lawsuit, you should contact McDonald's and try to resolve the matter with their insurance carrier.  If the case can't be settled with the insurance carrier, you could proceed with a lawsuit.  However, unless you prove that you became ill due to eating the raw chicken nuggets, your claim may result in a negligible amount of compensation if anything.  If unfortunately you do become ill due to this incident, you should document your illness with medical records, medical bills, and lost wages.  You should also save the raw chicken nuggets as evidence.