The Department of Health identified 42 people who fell sick with Salmonella Newport in 2011, but not all of them reported eating queso fresco, according to Julia Hall, an epidemiologist at the Utah Department of Health.
"Some of them we were not able to interview so we don't know how they contracted the illness," she said.
Eighteen of the 42 said they had consumed queso fresco, but whether it was Gomez's cheese remains unclear.
The Salt Lake Valley Health Department continues to investigate the restaurant that sold the contaminated cheese. The department previously issued a notice of violation to the owner requiring the cheese no longer be sold. A financial penalty, still to be determined, will be charged.
"That's where we'll recover our costs of our investigation," said Royal DeLegge, environmental health director at the department.
Health officials first became aware of a potential problem with Salmonella Newport in 2009 and the state continues to investigate whether there are other sources of the bacteria.
The agriculture department is not planning any further action against Gomez.