The source has been said to be in the deli, according to prior reports, but test results from four people and two deli employees expected by Friday will narrow the source, Sun-Times Media reports
Eleven people tested previously tested positive for the same strain of salmonella.
The deli was shut down briefly on June 11, after reports of people falling ill. All products were thrown away, company representatives said.
The exact source of the bacteria had not been determined at the time.
One mother is suing the store, alleging her son contracted salmonella from food purchased there. Colleen Ghelfi contends the tainted food caused her son's "severe gastrointestinal symptoms” including diarrhea and abdominal cramps, according to the suit. The boy tested positive for a salmonella infection June 3, Sun-Times Media reports.