The mutation would have to happen in the lab and not in the wild, since the pills would come from the lab. I imagine if such a thing did occur, they would just

The mutation would have to happen in the lab and not in the wild, since the pills would come from the lab. I imagine if such a thing did occur, they would just kill the batch they were breeding and start over from a known strain. (Not a microbiologist, so who knows though)