Yes, mouse DNA will be in that tissue that you just injected, AND!...
The current theory is that vitamin C has an extra electron, and so, when it gets near a virus (which isn't a full cell) it basically shocks it to death. (doesn't effect full cells because they can take it)
Interesting thing about that bat (Horseshoe Bat) is that it doesn't make vitamin C like many other animals (sunlight on skin and fur cells) but it makes vitamin C at the location its needed to control viral loads. (they were thinking that since they never found vitamin C inside the bat, that it couldn't be vitamin C that controlled the viral load)
But, we really can't talk about this because its all theory.
The only thing we can say is:
100% of people admitted to ICU had lower than adequate levels of Vitamin C and D.