I'm sure my fellow needle-phobes will agree this would be a wonderful development! This seems to be a promising line of research.
In a new study assessing the potential of a single-dose, intranasal COVID-19 vaccine, a team from the University of Iowa and the University of Georgia found that the vaccine fully protects mice against lethal COVID-19 infection. The vaccine also blocks animal-to-animal transmission of the virus.
The vaccine used in the study only requires a single dose and it may be stored at normal refrigerator temperatures for up to at least three months. Because it is given intranasally, the vaccine may also be easier to administer, especially for those who have a fear of needles.
The experimental vaccine uses a harmless parainfluenza virus 5 (PIV5) to deliver the SARS-CoV-2 spike protein into cells where it prompts an immune response that protects against COVID-19 infection. PIV5 is related to common cold viruses and easily infects different mammals, including humans, without causing significant disease. The research team has previously shown that this vaccine platform can completely protect experimental animals from another dangerous coronavirus disease called Middle Eastern Respiratory Syndrome (MERS).
www.news-medical.net/news/20210708/Intranasal-COVID-19-vaccine-protects-animals-against-lethal-COVID-19-infection.aspx
Research paper:
advances.sciencemag.org/content/7/27/eabi5246
Obviously human trials have to be done next, but it's a good start!