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.

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