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September 01, 2020 1:32pm
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South Africa study shows boosters failed to block omicron, bolstering case for face masks, distancing and hand washing

A study of some of the first breakthrough cases of COVID-19 caused by the highly infectious omicron variant found that booster shots of the mRNA vaccines failed to block that strain, although the infections involved only mild or moderate symptoms, confirming they are effective in preventing serious illness and death.
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