The Food and Drug Administration has upgraded its classification of a broccoli recall initially reported in late December, labeling it as “Class I” — the agency’s most serious recall category.

Braga Fresh, of Salinas, California, had initially issued an “advisory” for a specific lot of Marketside Broccoli Florets in late December, after Health and Human Services workers discovered Listeria monocytogenes in “multiple samples” from a Texas Walmart.

The broccoli had been distributed to Walmart stores in 20 states: Alaska, Arkansas, Arizona, California, Colorado, Idaho, Illinois, Indiana, Kentucky, Louisiana, Michigan, Montana, Nevada, Ohio, Oklahoma, Oregon, Texas, Utah, Washington and Wyoming.

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