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Bacteria might evolve “cross-resistance” to various antiseptics if mutations that help microbes survive quats also end up protecting them against other antiseptic products or medications, the story suggests.

Having a drug from a new class is important, because the rise of resistance to one drug from any class — such as fusion inhibitors or reverse transcriptase inhibitors — often creates cross-resistance to all similar drugs.

Researchers found that German cockroaches are becoming more difficult to eliminate because they are developing cross-resistance to insecticides.

The population growth was likely the result of cross-resistance, according to the study.

“If even a small percentage of cockroaches is resistant to an insecticide, and those cockroaches gain cross-resistance, a population knocked down by a single treatment could explode again within months,” the statement explains.