An ancient virus resurrected to cure hearing loss has had a profound impact in mice, restoring hearing so well that genetically deaf mice could hear something as soft as a whisper.

A year ago, researchers at Massachusetts Eye and Ear resurrected the virus seeking a better tool to deliver gene therapy. According to two studies published Monday in the journal Nature Biotech, researchers from Mass. Eye and Ear and Boston Children’s Hospital showed the virus successfully replaced genes in the hard-to-reach…