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That doesn't really follow.

For something to evolve like that you need to re-introduce the mutated strains back to the source.

If there is no re-introduction (which there wouldn't be, because the worms would be bred in an isolated environment and not the sewer system), then there isn't really anything to worry about. There is no selection pressure at the point where breeding and distribution occurs.

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Why would you need to reintroduce the mutated strains back to the source? They already have a plan for migrating from one host to another host; they don't need to migrate from their host back to a lab so their laboratory-bred eggs can be intentionally introduced into another host.

You might end up with strains that could survive in humans, but those wouldn't be the strains being prescribed to people.

even if the 'gradually-evolving' process isn't provided, isn't there some genetic chance? (be it really small -- like lottery?)

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)

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