Four days later, on June 28, the company recalled an additional 380,000 pounds of beef primal products. Samples from unopened packages of JBS Swift beef recovered from one ill patient's home were tested by the Michigan Public Health Laboratory and yielded an E. coli O157:H7 isolate that matched the "DNA fingerprint" of the outbreak strain.
Of the 23 ill persons, 17 have been confirmed by an advanced DNA test as having the outbreak strain; confirmatory tests are pending on others. The number of ill persons identified in each state is as follows: California (4), Maine (1), Michigan (6), Minnesota (1), New Hampshire (1), New Jersey (2), New Mexico (1), New York (1) and Wisconsin (6).
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Most of the beef packages in the first recall bear the establishment number "Est. 969" inside the USDA mark of inspection and have identifying package dates of "042109" or "042209." The pieces of beef (primal beef products) in the expanded recall were produced on April 21, 2009, and were distributed nationally and internationally. Boxes of these pieces of beef bear the establishment number "EST. 969" inside the USDA mark of inspection, the identifying package date of "042109," and a time stamp ranging from "0618" to "1130." These pieces of beef were sold to retail stores nationwide after April 21, 2009, and some were probably cut again or made into ground beef, then re-packaged, so packages purchased by consumers may not have identifying information.