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WHY SHOULD WE STILL WEAR MASKS?
Throughout our analyses, we have found mask-wearing reduces the risk of transmission by about 50%, and that still holds true. At the individual level, you have a reduced risk of both transmitting and being infected of about 50%, and this probably varies by the type of mask that you wear. At the population level, for the first time in our models, we’re finding that the population effect of enhanced mask-wearing is quite small, about a 10% reduction in cumulative infection from Omicron from now forward. It’s still there, but in the grand scheme of things, it’s relatively small.
The reason why these are both true statements – the 50% reduction with a mask and 10% at a population level – is that the risk of transmission of Omicron among so many people in a community is so great that even a 50% reduction doesn’t really do anything at a population level. Think about it like this: on a given day, if you’re going to be exposed to Omicron six times, you may be exposed only three times if you’re wearing a mask, but you’re still going to get infected. That’s sort of how the logic plays out in our modeling – it’s about the speed and intensity of Omicron. We still strongly believe that the act of wearing a mask reduces the risk of infection on a 1:1 basis.