A Covid vaccination for inhalation has received approval for the first time in China.
It is produced by CanSino and uses a safe adenovirus as a carrier for the genetic information that instructs the body how to combat Covid.
According to the manufacturer, Convidecia Air can start working well as protection after just one breath when inhaled as a fine mist.
Other researchers have been looking on nasal spray vaccines, including groups in the US and the UK.
The lining of the nose and upper airways, where Covid generally enters the body, may benefit from additional immunity as a result, according to scientists.
CanSino received authorization from the National Medical Products Administration of China to utilise its inhaled vaccination as a booster dosage.
It can add additional protection for those who have already received a jab.
In the meantime, Scotland, Wales, and England have started the most recent Covid vaccine booster programme.
Health officials in the UK report a decline in infections, but they anticipate a resurgence of the cold and flu this fall and winter.
They are advising anyone who can to get both vaccinations in order to safeguard themselves from serious sickness.