Researchers Resurrect Extinct Virus to Gene Therapy Use

Modern molecular biology holds the promise of allowing us to correct genetic diseases. Experiments with gene therapy indicate that it should be possible to provide a functional version of a gene to cells that have a defective copy.

Source: Researchers resurrect extinct virus to use for gene therapy

Recreating an ancient virus for the specific reason that nobody’s immune system has the tools to deal with it.  What could possibly go wrong?