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Clustered Gram-negative Salmonella Typhimurium bacteria are shown under a magnification of 5000X in a colorized scanning photomicrograph. (AP Photo/Centers for Disease Control and Prevention, Janice Haney Carr) ** FILE **
Photo by: Janice Haney Carr
Clustered Gram-negative Salmonella Typhimurium bacteria are shown under a magnification of 5000X in a colorized scanning photomicrograph. (AP Photo/Centers for Disease Control and Prevention, Janice Haney Carr) ** FILE **

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