A new creature as in: a new species? That’s possible if the genetic modification results in at least two individuals that cannot reproduce with anyone other than each other.
By the way we’ve already got a lot of genes that came from viruses. Our DNA consists of 9% (retro)viruses. These genes can lead to things like developing new organs. That’s what happened with lizards when their eggs got infected with a virus: the resulting lizard-offspring can now grow placenta’s.
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