Biologically speaking, you should keep this species. Because its unique biochemistry possesses the secret of penetration and adoption to human immune system. If

Biologically speaking, you should keep this species. Because its unique biochemistry possesses the secret of penetration and adoption to human immune system. If the species is lost, this will be lost too and we shall hardly ever achieve tech of curing human body with internal self-delivering mech agents, like the famous "Kremlin Pill", just going through the body, not the intestines.