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Raw tuna in sushi could be to blame for a Salmonella outbreak that has already sickened 25 people from California and elsewhere.

The particular strain had not been seen in humans or animals until last month, which makes the outbreak particularly challenging, according to the Ventura County Public Health Department.

“We are not flying with the experience that we would normally have with this organism,” county Health Officer Robert Levin said.

More than 80% of the affected patients reported eating raw tuna as well as sushi, the health department said.

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