Reheating gets rid of some bacteria , but not necessarily all of the toxins produced by leaving food alone for too long. Once present, toxins can lead to illness even if the bacteria are k*lled.
When reheating, heat thoroughly, making sure the meat is piping hot throughout.
When in doubt: throw it away
Prevention is better than cure. If:
the meat has been out for more than 2 hours (or 1 hour in hot conditions),
