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FAIRFIELD — A Mexican restaurant in Fairfield is closed as Solano County health officials investigate an outbreak of Campylobacter.

“Not everybody goes to their doctor, not everybody gets tested, so there’s probably others who potentially got sick,” Solano County Deputy Health Officer Michael Stacey said.

Stacey told FOX40 the common thread between the people who became ill was that they ate at Alejandro’s on or after May 26. He said people at risk may have eaten at Alejandro’s between May 26 and June 8.

“Undercooked meat is a likely source, we don’t know what the source is in this case, so here in the lab, we’re testing lots of food specimens and seeing if we can figure out exactly what the source of Campylobacter is,” Stacey said.

Alejandro’s did not respond to FOX40’s requests for comment.

Stacey said the symptoms usually last for a week.

“People get diarrhea, typically a fever with that, occasionally the diarrhea can be bloody usually the symptoms will last a couple of days and resolve on their own,” Stacey said.