Investigators used whole genome sequencing (WGS) to get more information about the DNA fingerprint of the outbreak strains of Salmonella Montevideo and Salmonella Senftenberg causing illness. WGS showed that isolates of Salmonella Montevideo from ill people were closely related genetically. In addition, WGS showed that Salmonella Montevideo isolates from raw pistachios collected from Paramount Farms were also closely related genetically to isolates from 9 ill people. This close genetic relationship provided additional evidence that people became ill from consuming pistachios produced by Wonderful Pistachios.