'On Oct. 4, Aissam was treated at the Children’s Hospital of Philadelphia, becoming the first person to get gene therapy in the United States for congenital deafness. The goal was to provide him with hearing, but the researchers had no idea if the treatment would work or, if it did, how much he would hear.

The treatment was a success, introducing a child who had known nothing of sound to a new world.'

https://www.nytimes.com/2024/01/23/health/deaf-gene-therapy.html