The trace-back investigation for the new outbreak is underway as cases mount across the country.
A day after implicating the brand in the outbreak, re-examination of the test result led the agency to retract the finding.
The lettuce originated from one supplier in Mexico. People in the 5 states are urged to skip eating shredded iceberg lettuce at Taco Bell.
As the outbreak continues, identifying the source of Cyclospora remains a challenge.
Michigan officials confirm more than 2,600 cyclosporiasis cases.
Surveillance of the parasite has been optional for a year; meanwhile, cases in Michigan top 1,200.
Eleven of the cases have been in Florida, with Georgia reporting one case.
The number of cases in the cyclosporiasis outbreak in southeastern Michigan has grown to 700.
Nara Organics has recalled the tainted powdered formula.
Over the holiday weekend cyclosporiasis cases in Michigan increased by 300 cases, to 572.
