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smallpox vaccine wasn't 100% effective. Still didn't stop it being used to wholly eradicate smallpox.
By a similarly startling mechanism, starting a media campaign to put lids on water tanks and empty stagnant ponds managed to completely eradicate Malaria in in the UK in n the 1950s.
It just got the R rate down just low enough in the mosquito population.
mashton
Brommers
Indeed. Even a partially effective vaccine has a massive effect on transmission rates. The maths is really quite simple. The smallpox vaccine wasn't 100% effective. Still didn't stop it being used to wholly eradicate smallpox.