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Vaccines were more effective at preventing infection, but their effectiveness in that area has declined with newer variants. Lessening the length and severity of symptoms also plays some role in reducing transmission since coughing, sneezing, and runny noses are a great way to spew virus into the world around you.

Although I hope we will see vaccines that do a better job at preventing infection and transmission the benefits we're getting from them right now are enough that everyone who can should be vaccinated and boosted as needed to maintain those benefits.