Regulators in China and India have cleared Covid-19 vaccines delivered through the nose and mouth, a new kind of shot that promises better protection against infection. But questions loom over how effective they will be.
HONG KONG—A new generation of Covid-19 vaccines that can be inhaled or sprayed up the nose—instead of taken by injection—will begin rolling out in Asia, though just how effective they are remains to be seen.
, a delivery that scientists say holds the promise of more potent protection against Covid-19 by better reducing infections and preventing the disease’s spread among vaccinated people because they work in the nose and lungs where transmission first happens.
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