The vaccine, called Convidecia Air, changes the liquid form of the vaccine into an aerosol using a nebuilzer. The vaccine can then be inhaled through the mouth using the nebulizer machine. The needle-free vaccine “can effectively induce comprehensive immune protection in response to SARS-CoV-2 after just one breath,” Cansino said in a statement.
In July, Chinese scientists published a pre-print study showing that people who received one booster dose of Cansino’s inhaled vaccine after two doses of the inactivated jab from Chinese maker Sinovac developed more antibodies than people who received three Sinovac shots. Four weeks after receiving the inhaled booster, 92.5% of people had developed neutralizing antibodies for Omicron.
Those who got three doses on Sinovac’s jab did not demonstrate any neutralizing antibodies for Omicron, either four weeks or six months after getting a booster.
Spray vaccines will be our best chance to stop Covid.
However, there are two big problems that have to be solved.
The first problem is keeping up with the blitzkrieg mutation capacity that Covid has. Our best chance to do that is with the mRNA technology, which permits vaccine generation with minimal delay. However, mRNA vaccines are too fragile to be suitable for a nasal or oral spray. The particles would be destroyed before they could activate the mucosal immune system.
But it is still possible, using laboratory technology to convert this mRNA into peptides and proteins suitable for use as a spray. Using AI to generate three dimensional shapes, surely a stable molecule of suitable configuration and stability could be eventually generated.
The second appears to have been partially solved by the Chinese, according to the Fortune article, namely getting an injectable vaccine into a suitable form and dose to survive the bodies mucosal clearance mechanisms and enzymes, designed to keep foreign sprays and mists out of the body, in enough concentration to stimulate the mucosal immune system.
Our bodies have developed a parallel Defense system using a unique immunoglobulin, IGA, and special support cells. When stimulated, immunity bristles as a first line of defense to deny incoming viruses entrance to the body. This is what is needed to prevent infection from occurring in the first place, so extremely important for a highly infectious and potentially lethal virus such as Covid.
The Chinese, with their autocratic system, have a better chance of making everybody take this vaccine, even though it requires a cumbersome liquid nebulizer to generate the mist.
Better would be a handheld inhaler, and, hopefully, this is what some dozen pharmaceutical corporations, working on a nasal or inhaled vaccine , are aiming for.