Efforts to prevent Salmonella food poisoning have been greatly improved now that it is understood that eggs can be contimaminated during their development inside the hen. Flocks are carefully tested, and eggs from infected chickens can be pasteurized to kill the bacteria. Efforts have been made to carefully educate the public about safe handling and cooking practices for both poultry and eggs. People who own pets that can carry Salmonella are also being more educated about more careful handwashing practices. It is unlikely that a human immunization will be developed, because there are so many different types of Salmonella enteritidis. However, researchers are close to producing an oral vaccine for poultry, which will prevent the Salmonella bacteria from infecting meat or eggs.
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