When a flea bites an infected rodent, it ingests the bacteria, which then multiply and block the flea's digestive tract. Rodent fleas feed on the blood of their hosts.
Natural Sources and the Ecological Origins of Yersinia Pestis
Modern Surveillance and Origin Tracking Today, public health agencies maintain surveillance programs specifically designed to monitor the origins and movement of Yersinia pestis. In the United States, for example, ground squirrels, prairie dogs, and wood rats are common carriers.
This ancestor caused milder gastrointestinal illnesses. Historical Context and Evolutionary Origins Scientific research, including genome sequencing, suggests that Yersinia pestis evolved from a less virulent ancestor, Yersinia pseudotuberculosis, relatively recently in evolutionary terms, possibly within the last 2,000 to 20,000 years.
Natural Reservoirs and Ecological Origins of Yersinia Pestis
The specific rodent species vary by region, but the ecological function remains the same. Conversely, periods of abundant rainfall can lead to surges in rodent populations, increasing the density of the pathogen in the area.
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