The bacteria that cause plague, Yersinia pestis, maintain their existence in a cycle involving rodents and their fleas. In urban areas or places with dense rat infestations, the plague bacteria can cycle between rats and their fleas. The last urban outbreak of rat-associated plague in the United States occurred in Los Angeles in 1924-1925. Plague bacteria are most often transmitted by the bite of an infected flea. Plague-infected fleas usually bite rates or mice, but dogs and cats may also bring infected fleas into the home. Question: who is the host and who is the agent?
The bacteria that cause plague, Yersinia pestis, maintain their existence in a cycle involving rodents and their fleas. In urban areas or places with dense rat infestations, the plague bacteria can cycle between rats and their fleas. The last urban outbreak of rat-associated plague in the United States occurred in Los Angeles in 1924-1925. Plague bacteria are most often transmitted by the bite of an infected flea. Plague-infected fleas usually bite rates or mice, but dogs and cats may also bring infected fleas into the home. Question: who is the host and who is the agent?
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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The bacteria that cause plague, Yersinia pestis, maintain their existence in a cycle involving rodents and their fleas. In urban areas or places with dense rat infestations, the plague bacteria can cycle between rats and their fleas. The last urban outbreak of rat-associated plague in the United States occurred in Los Angeles in 1924-1925. Plague bacteria are most often transmitted by the bite of an infected flea. Plague-infected fleas usually bite rates or mice, but dogs and cats may also bring infected fleas into the home.
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