[LeonM]

Your comment is downvoted, but I had the exact same thought.

What are the long-term risks if we start injecting people with large quantities of a virus to battle another decease? Could that virus evolve into something much worse than cancer?

[kennywinker]

It's not the injecting large quantities of virus that poses a risk, it's genetically modifying viruses and then exposing people to them that is risky.

I would hope that quarantine procedures around any human made-or-modified virus would be quite strict to avoid something unwanted making it's out of the lab.

[cmollis]

My mother died a year ago from multiple myeloma and And I can tell u that she would have much preferred measles.