The most interesting parts of this to me are the uncommon but generalizable techniques being used 1) the vaccine is delivered nasally 2) chitosan is used a

The most interesting parts of this to me are the uncommon but generalizable techniques being used 1) the vaccine is delivered nasally 2) chitosan is used as the adjuvant The two seem linked since chitosan seems to be developed in particular to be safer in the context of a nasal vaccine. One understandable concern of vaccine opponents is the injection of mercury as a preservative. This has now been eliminated from most vaccines, but vaccines also usually use alum (aluminum), which is also concerning. [1] Chitosan might be a much safer alternative. [1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4344667/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4344667/