Viruses will mutate back on its own. A virus is like a heterosexual female in her teens - looking to reproduce and thinking about future generations. The faggots of the viral world kill thier host and therefore are unable to spread.
It is in the virus' best interest to mutate to be more contagious and less symptomatic in the host.
This is true but to an extent it depends on what you start with. Releasing small pox would be uncontrollable. It wouldn't kill everyone but it would kill a lot and you couldn't control who it infected. That's why they started with something benign like the common cold and just tweaked the symptoms to be a little different and subjectively "worse". The virus was never meant to be the killer just the trojan horse for the vaccine.
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