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Keywords: Flea infected with yersinia pestis.jpg en A flea infected with yersinia pestis shown as a dark mass The foregut of this flea is blocked by a Y pestis biofilm which is a prerequisite for efficient transmission 2006-04-27 http //www niaid nih gov/labsandresources/labs/aboutlabs/lzp/plaguesection/Pages/hinnebusch aspx National Institute of Allergies and Infectious Diseases-photographer not listed PD-USGov Uploaded with UploadWizard Unidentified Siphonaptera Yersinia pestis |