What are nasal vaccines? Nasal vaccines are administered through the nose. More accurately called intranasal vaccines, these vaccines are liquids that can be given as a spray or through a dropper or syringe.
The most common nasal vaccine is FluMist, a nasal spray that uses inactivated flu virus to protect against influenza. An intranasal vaccine could be a weakened live virus similar to FluMist, a nucleic acid vaccine like mRNA coronavirus vaccines or a protein vaccine like Hepatitis B vaccines or the CorbeVax coronavirus vaccine.
Intranasal vaccines are best suited to protect against pathogens that enter through the nose, like the flu or the coronavirus.
By mimicking the first step of natural exposure to an airborne pathogen, these vaccines help train a person's immune system at the potential place of infection.