Scanning electron microphotograph depicting a mass of Yersinia pestis bacteria (the cause of bubbonic plague) in the foregutte of the flea vector

Credit: Rocky Mountain Laboratories, NIAID, NIH http://www3.niaid.nih.gov/biodefense/Public/Images.htm

Text of cropped caption: DD2017 10.0kV X20.0K 1.50µm

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