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With a sniff or a swallow, new vaccines aim to put the brakes on Covid-19 spread
Injected vaccines against the coronavirus that causes Covid-19 have been hugely successful, saving nearly 20 million lives globally in their first year of use and slashing the pandemic's death toll by an estimated 63%, according to a recent study. Yet good as these shots are, they have not stopped the virus from spreading from person to person.
https://www.cnn.com/2022/07/18/health/mucosal-immunity-covid-19/index.html
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