Bubonic plague, caused by Yersinia pestis, is characterized by the presence of 'buboes,' which are:
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Correct answer: Swollen and hemorrhagic regional lymph nodes
Buboes are the hallmark of the bubonic form of plague. They represent regional lymph nodes that have become exquisitely tender, swollen, and necrotic due to the rapid multiplication of Yersinia pestis following an infected flea bite.
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