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what is meant by bacteria in the 'plaque'? what is plague

When a person becomes infected with the bacteria that cause bubonic plague (Yersinia pestis), the bacteria begin to multiply within the lymph system. (The lymph or lymphatic system is a major component of your body's immune system. The organs within the lymphatic system are the tonsils, adenoids, spleen, and thymus.)
 Bacteria: one-celled organisms, spherical, spiral, or rod-shaped and appearing singly or in chains, comprising the Schizomycota, a phylum of the kingdom Monera (in some classification systems the plant class Schizomycetes), various species of which are involved in fermentation, putrefaction, infectious diseases, or nitrogen fixation.


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