Iceberg lettuce is harvested at a farm near Yuma, Ariz., on March 6, 2012. A recent outbreak of cyclosporiasis has been linked to iceberg lettuce that Taylor Farms supplied to Taco Bell. (Nicole Bengiveno/The New York Times) By CHRISTINA JEWETT and JULIE CRESWELL Grocers and retailers rushed to pull products containing iceberg lettuce off shelves on Saturday, as Taylor Farms issued a recall, notifying customers that lettuce shipped to 27 states may have been contaminated. The largest produce…