Medical Definition of pneumonic plague
: plague of an extremely virulent form that is caused by a bacterium of the genus Yersinia (Y. pestis synonym Pasteurella pestis), involves chiefly the lungs, and usually is transmitted from person to person by droplet infection — compare bubonic plague
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“Pneumonic plague.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/pneumonic%20plague. Accessed 12 Aug. 2022.
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