We may have a resilient plague with this hardy little microbe. The natural population checks on the planet will keep trying till it finds a means to balance a population growing in urban mega-slums unchecked like a cancer. Isolated regions survived the pandemic of 1918 as long as they maintained quarantine, when they thought it was over and let down their guard it hit them too. Science never did find a viable vaccine for that one, there's no guarantee they'll find any vaccine for this one either.

Those who fail to learn from the mistakes of history are doomed to repeat them.

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“Never attempt to teach a pig to sing; it wastes your time and annoys the pig.” ― Robert A. Heinlein