Made by CanSino, it has similar ingredients to its injected vaccine, using a harmless adenovirus as the carrier of the genetic code that teaches the body to fight Covid.
Inhaled as a fine mist, Convidia Air can provide good protection after just one breath, the company says.
Scientists say these can provide additional immunity in the lining of the nose and upper respiratory tract, where covid typically enters the body.
China’s National Medical Products Administration has granted CanSino approval for its inhaled vaccine to be used as a booster dose.