Allison Snow writes, “When I first learned about Mice Against Ticks, I was shocked but also intrigued… The outcome of this radical intervention might influence how society views the acceptability of altering the genes of other animals, and perhaps even our own.”

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Kevin Esvelt of MIT writes, “The epidemic of Lyme disease is an ecological problem of our own making: We have inadvertently altered our environment to maximize the number of infected ticks. The question today is whether we should consider altering the genomes of wild animals to undo that mistake.”

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But new insights are at last accumulating

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