CDC is collaborating with public health officials in several states and the FDA to investigate a multistate outbreak of Salmonella Paratyphi B variant L(+) tartrate(+) infections. The investigation has not conclusively identified the source of this outbreak, but most ill people interviewed reported eating sushi made with raw tuna in the week before becoming ill. The investigation is ongoing and has not identified a common brand or supplier of raw tuna linked to illnesses.

This outbreak is caused by Salmonella Paratyphi B variant L(+) tartrate(+) bacteria. The illness caused by this bacteria typically includes diarrhea, fever, and abdominal cramps 12-72 hours after being exposed. Salmonella Paratyphi B variant L(+) tartrate(+) does not cause paratyphoid fever, enteric fever, or typhoid fever.

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