Lyme disease is caused by a bacterium transmitted to humans by deer ticks. Generally, deer ticks pick up the bacterium while in the larval stage by feeding on infected white-footed mice. However, certain other species on which the larvae feed do not harbor the bacterium. If the population of these other species were increased, more of the larvae would be feeding on uninfected hosts
the number of ticks acquiring the bacterium would likely decline.
Whether the infected deer tick population could be controlled by increasing the number of animals that prey on white-footed mice