Most vaccines in human testing require two shots for effectiveness,
and developers still aren't even sure if they'll prevent infections.
Scientists are hoping to generate superior immune responses with
inhaled vaccines that directly target the airway cells the virus
invades.
https://economictimes.indiatimes.com/industry/healthcare/biotech/pharmaceuticals/inhaled-vaccines-aim-to-fight-coronavirus-at-its-point-of-attack/articleshow/78607311.cms
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