The Food and Drug Administration said Monday state and federal inspectors found the bacteria in "critical areas" at Setton Pistachio of Terra Bella, Inc.
FDA officials also say they found areas at the facility where raw and roasted nuts could become cross-contaminated with salmonella.
The plant temporarily shut down after recalling more than 2 million pounds of nuts last week.
The company has now expanded its recall to include all raw and roasted pistachios from its 2008 crop.
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