Mutating mice becoming a growing problem

A study suggests mice are rapidly evolving resistance to common rodenticides.

Researchers tested rodent samples from New York City, Washington, D.C., New Jersey and the Philadelphia region and found many mice carry mutations that help them survive poison.

They show a much higher mutation frequency than we thought before.

The study found about 70% of sampled mouse populations had mutations tied to rodenticide resistance.

The findings come as sanitation, inspections and extermination efforts expand to reduce rodents.

Researchers say rats are adapting differently, often learning to avoid traps and other control methods.

Pest control experts say some treatments now take longer to work than they once did.

Researchers warn pest-control strategies must adapt as rodents do.

Experts recommend relying less on pesticides and more on prevention, including secure trash storage, fewer food sources and better sanitation.

Because new pest-control chemicals can take years and significant investment to develop, researchers say preserving existing products remains important.

Researchers say more U.S. studies are needed to understand rodent adaptation and help cities stay ahead of pests.