Wikipedia: "The measles vaccine is effective at preventing the disease"
Wikipedia: "Smallpox was eradicated by a massive international search for outbreaks, backed up with a vaccination program, starting in 1967."


@alexbuzzbee plus many people in the current measles outbreak were vaccinated.

@orangesec_0 Vaccination reduces the rate of harm. It does not eliminate it. Having a sufficient vaccination rate among people with healthy immune systems protects people with weak immune systems against diseases that would otherwise harm them.

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