Experts said that nasal spray COVID-19 vaccines will be more effective.
The senior officials from Health Department said that most vaccines in human testing require two shots for effectiveness, and developers still aren’t even sure if they’ll prevent infections.
The Covid-19 vaccines closest to the finish line are designed to be injected into the arm. Researchers are looking at whether they can get better protection from inoculations that fight the virus at its point of attack – the nose and mouth.
Scientists are hoping to generate superior immune responses with inhaled vaccines that directly target the airway cells the virus invades.
An alternative to conventional jabs, sprayed and inhaled immunizations under development in the U.S., Britain and Hong Kong could play an important role in helping society escape restrictions that have upended economies and everyday life. Among their goals is to prevent the pathogen from growing in the nose, a point from which it can spread to the rest of the body, and to other people.