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>>Booster effectiveness relative to primary series was 26·2% (95% CI 23·6–28·6) against infection

Sorry, maybe I'm an idiot, but what does this mean? "Effectiveness against infection" - does that mean that 26% of participants who got the booster did not contract corona-19?

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> For example, an effectiveness of 40% means that incidence of infection in the three-dose cohort was 40% less than that in the two-dose cohort.

It’s a relative hazard ratio. % less likely to get COVID vs. the cohort with just the vaccine

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