Experts Warn: Mice and Rats Developing Resistance to Rodent Poisons

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Warning for Pest Control: Common rodent poisons are becoming less effective, according to recent scientific research. Studies indicate that both mice and rats are evolving resistance to these widely used poisons.

Data from new research reveals a startling number of house mice carrying genetic mutations linked to rodenticide resistance, leading to higher survival rates against common pest control methods.

In the northeastern United States, nearly 70% of house mice sampled were found to possess a known genetic mutation that enhances their survival against standard rodenticides. Furthermore, about 35% of Norway rats, commonly referred to as brown or sewer rats, exhibited similar mutations.

House mice adapt to rodent poisons faster than rats – Credit: Getty

A team at Rutgers University initiated this study after pest control professionals reported an increasingly resistant rodent population.

Pest management expert Jin Jia Yu noted that, “Despite the effectiveness of rodenticides, controlling rodent populations has become increasingly challenging in various regions.”

The researchers analyzed DNA from 147 house mice and 143 Norway rats collected across northeastern states, including New York and Washington, D.C.

Findings revealed a significant proportion of rodents carrying mutations in a gene called Vkorc1, which is connected to resistance against anticoagulant rodenticides—one of the most common types employed in the U.S.

“Mouse resistance is more widespread than previously understood,” stated Professor Yu. “Although Norwegian rats also exhibit genetic mutations, it remains unclear how these mutations affect their sensitivity to rodenticides.”

As emphasized by study co-author Changlu Wang, rodents pose more than just a nuisance; they represent a tangible public health risk.

“As rodent populations evolve, it becomes crucial to implement science-based management strategies that safeguard public health and the environment,” he added.

“Research like this sheds light on how rodent populations are changing, necessitating adaptations in management strategies,” concluded Professor Wang.

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Source: www.sciencefocus.com