They aren’t using live sars-cov2 virus. They want to use the nose so that people will gain immunity to infection. Also, people hate needles. Muscle injections generate a different type of immunity which is robust against system-wide infection (hospitalization) but not against the initial infection which begins in the respiratory system. FluMist, which is also delivered as a nasal mist, is reasonably effective and has been available for years.
They aren’t using live sars-cov2 virus. They want to use the nose so that people will gain immunity to infection. Also, people hate needles. Muscle injections generate a different type of immunity which is robust against system-wide infection (hospitalization) but not against the initial infection which begins in the respiratory system. FluMist, which is also delivered as a nasal mist, is reasonably effective and has been available for years.