Yersinia pestis

[pĕstĭs]

n.

A bacterium that causes plague and is transmitted from rats to humans by the rat flea Xenopsylla cheopis.Pasteurella pestis

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.