Two immunologists say an intranasal Covid vaccine can elicit an immune response at the site of infection – the respiratory tract. Intranasal vaccination, which is administered through the nose, is also needle-free, meaning that more people may be willing to get vaccinated. Ultimately, using both intramuscular and intranasal Covid vaccines may be effective in combating Covid-19. Out of the 108 Covid-19 vaccines that are currently undergoing clinical trials, only eight are delivered intranasally (through the nose) – the rest are mainly given intramuscularly (into the muscle). Considering ...