NEW YORK (AP) — Big U.S. restaurant chains don't get linked to foodborne illness outbreaks often, but the number of meals they serve causes a lot of concern when contamination

“Early information has shown lettuce as a common product that regularly comes up during the investigation,” said the Michigan health department.

Shredded iceberg lettuce supplied by Taylor Farms and sold at some Taco Bell restaurants has been linked to a multistate outbreak of cyclosporiasis, a source familiar with the…