Are inhaled Covid-19 vaccines the future? A Chinese firm thinks so

Every Covid-19 vaccine that has been cleared for use so far is meant to be injected into the upper arm, but scientists are exploring a different method of delivery – through the nose and mouth.

Of the more than 100 Covid-19 vaccines undergoing clinical studies recognised by the World Health Organization, eight are intranasal vaccines.

These are designed to target the mucosa of the nose and throat area where the coronavirus first enters the body, and offer a different immune response.

Last week, China’s CanSino Biologics published the results of an early-stage clinical trial which found that an aerosol inhaled version of its Ad5-nCoV vaccine – which is already approved for use in a single-dose, injectable form in China, Pakistan and Mexico – triggered immune responses without serious side…