As of June 4, 2015, 53 ill people infected with the outbreak strain of Salmonella Paratyphi B variant L(+) tartrate(+) have been identified. CDC and state and local public health partners are continuing laboratory surveillance through PulseNet to identify additional ill people and to interview them about foods they ate before they became ill. The number of ill people reported from each state is as follows: Arizona (10), California (31), Illinois (1), Mississippi (1), New Mexico (6), South Dakota (1), Virginia (1), Washington (1), and Wisconsin (1).

As a result of the ongoing investigation, the Maricopa County Environmental Services Department working with the Arizona State Public Health Laboratory tested unopened frozen ground tuna products. Arizona identified Salmonella Newport in one sample and Salmonella Weltevreden in another sample. The unopened frozen ground tuna products represented two different lots of product imported from Indonesia by Osamu Corporation of Gardena, California. On May 27, Osamu Corporation recalled[PDF – 1 page] the two lots of ground frozen yellowfin tuna imported from Indonesia due to possible Salmonella contamination.

A search of the PulseNet database did not identify any known human illnesses linked to the recall. State health departments continue to test samples of raw tuna products but the strain of Salmonella Paratyphi B variant L(+) tartrate(+) linked to the outbreak has not been identified.

FDA reports it has increased its monitoring of tuna. Additionally, FDA is conducting a traceback investigation. FDA is evaluating and analyzing records to determine whether there is a common source of raw tuna linked to the outbreak.

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