Yersinia pestis
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Yersinia pestis is a gram-negative, non-motile, coccobacillus bacterium without spores. It is related to pathogens Yersinia enterocolitica, and Yersinia pseudotuberculosis, from which it evolved. Yers
Yersinia pestis
Oriental rat flea (Xenopsylla cheopis) infected with the Y. pestis bacterium, which appears as a dark mass in the gut: The foregut (proventriculus) of this flea is blocked by a Y. pestis biofilm; when the flea attempts to feed on an uninfected host, Y. pestis is regurgitated into the wound, causing infection.
Gram-negative bacteria
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Gram-negative bacteria are bacteria that, unlike gram-positive bacteria, do not retain the crystal violet stain used in the Gram staining method of bacterial differentiation. Their defining characteri
Yersinia pestis
…Yersinia pestis (Y. pestis; formerly Pasteurella pestis) is a gram-negative, non-motile, coccobacillus bacterium without spores. It is related to pathogens Yersinia enterocolitica, and Yersinia pseudotuberculosis, from which…
Microscopic image of gram-negative Pseudomonas aeruginosa bacteria (pink-red rods)