Scientists believe vaccines administered through the nose may be better suited to prevent the infection, compared to the shots administered intramuscularly.

from Times of India https://timesofindia.indiatimes.com/life-style/health-fitness/health-news/coronavirus-nasal-vaccines-may-hold-the-promise-to-stop-covid-infections-how-soon-will-we-get-them/photostory/93001144.cms