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In reply to the discussion: CDC study shows three-fourths of people infected in Massachusetts covid-19 outbreak were vaccinated [View all]thesquanderer
(12,026 posts)...things like what percentage of the population is that we're talking about, and what the vaccination rate is.
To make the point: Imagine we get to a day where 100% of people in a city vaccinated. Despite vaccinations, some people will still get it. And a similarly true (but misleading) headline would be, "CDC study shows 100% of people infected in this covid-19 outbreak were vaccinated." In areas where vaccination rates are 80% or whatever, you will also see that a greater percentage of people who get covid were vaccinated, because essentially, the population consists overwhelmingly of people who were vaccinated.
So then absolute numbers and percentages come into play as well. Let's say it's a city of two million people, and two people got it. It would still be true that 100% of the infected people were vaccinated, but it would also be only one in a million.
Without knowing what percentage of the population got sick AND what percentage of the population were vaccinated, a statement like the one in the headline tells you nothing.