RT Book, Section A1 Kugeler, Kiersten J. A2 Boulton, Matthew L. A2 Wallace, Robert B. SR Print(0) ID 1182667527 T1 Plague T2 Maxcy-Rosenau-Last Public Health & Preventive Medicine, 16e YR 2022 FD 2022 PB McGraw Hill PP New York, NY SN 9781259644511 LK accessmedicine.mhmedical.com/content.aspx?aid=1182667527 RD 2024/04/18 AB Plague is a highly virulent zoonosis that has claimed hundreds of millions of lives over recorded history.1–3 The etiologic agent, Yersinia pestis, persists in complex enzootic cycles of rodents and fleas in discrete geographic foci in Asia, Africa, and the Americas. Humans are incidental hosts, most often infected by flea bites, but also by direct contact with infected animal tissues or inhalation of infectious respiratory droplets. The clinical syndrome varies with route of inoculation of the bacterium, resulting in three primary clinical forms, bubonic, septicemic, and pneumonic plague. Although most cases of plague are sporadic and effective therapy exists, periodic outbreaks can generate fear among the public, driven by misinformation. Plague remains a persistent public health concern due to its rapid clinical course, high mortality, and potential for epidemic spread. Y. pestis is currently classified as a Tier 1 select agent, subject to high-level regulation and oversight, due to both its past and potential use as a bioweapon.4