Nasal spray vaccines against COVID, the flu, and RSV potentially work better than shots. Even if they only work about equally, it’s still a huge innovation since I suspect a lot of vaccine hesitancy is really discomfort around needles.
New Nasal Vaccines Offer Stronger Protection from COVID, Flu, and More—No Needle Needed
Gentle nasal spray vaccines against COVID, the flu and RSV are coming. They may work better than shots in the arm
scientificamerican.com