FDA has implemented regulations to help prevent egg contamination in the farm or during transportation and storage. It requires that all shell egg boxes that have not been treated to destroy Salmonella have the following safe-handling statement:
To prevent bacterial diseases: keep eggs refrigerated; cook eggs until yolks are firm; and fully-
cook egg-containing foods.
Shell eggs that have been pasteurized to destroy Salmonella do not need to have the Safe-Handling Instructions, but signs will usually say that they have been treated.