Natural occurrence is how almost every known virus exists.
Given that prior, "can you disprove the lab" is the Russell's Teapot hypothesis. No, I can't. I also can't disprove it rode in on a meteorite or was beamed in by aliens. And I'm not about to start.
Given that prior, "can you disprove the lab" is the Russell's Teapot hypothesis. No, I can't. I also can't disprove it rode in on a meteorite or was beamed in by aliens. And I'm not about to start.