Any diseases designed to survive outside the body have a chance to infect downstream survivors. A very small chance. The great, great majority would suffer degradation from the sun and from chemicals, metals, and bacteria in the water and degrade to the point of nonviability within days. Those that reach and get inside a human are most likely to be stopped by his immune system. Those that reach and infect mice are likely to quickly become more adapted to infecting mice.
IMO the most likely scenario is this would result in an outbreak years down the line from a virus designed to be very nasty in humans transferring from some animal back to humans.
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