An in-shell egg pasteurization installation includes a temperature raising stage having a microwave cavity or microwave cavity portion into which microwaves can be radiated and a pasteurization stage having a microwave cavity or microwave cavity portion into which microwaves can be radiated. The installation is configured so as to provide radiant or conductive heat to an in-shell egg located in the temperature raising stage and to an in-shell egg located in the pasteurization stage, and to provide relative displacement between an in-shell egg and the microwave cavities or microwave cavity portions.
