News release: “CDC is collaborating with public health officials in multiple states, the U.S. Food and Drug Administration (FDA), and the U.S. Department of Agricultures Food Safety and Inspection Service to investigate a nationwide increase of Salmonella Enteritidis (SE) infections with an indistinguishable pulsed-field gel electrophoresis (PFGE) pattern JEGX01.0004. This is the most common PFGE pattern for SE in the PulseNet database. Investigators are using DNA analysis of Salmonella bacteria obtained through diagnostic testing to identify cases of illness that may be part of this outbreak. Because the outbreak PFGE pattern (outbreak strain) commonly occurs in the U.S., some of the cases identified with this outbreak strain may not be related to this outbreak.”