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Photo by: Janice Haney Carr

** FILE ** Clustered Gram-negative Salmonella Typhimurium bacteria, the type linked to a salmonella outbreak that resulted in the recall of more than 1,500 foods, are shown under a magnification of 5000X in a colorized scanning photomicrograph. (AP Photo/Centers for Disease Control and Prevention, Janice Haney Carr)

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