https://medicalxpress.com/news/2022-02-nanoparticle-sars-cov-vaccine-combines-immune.html
“Nucleic acid delivery of immune-focused SARS-CoV-2 nanoparticles drives rapid and potent immunogenicity capable of single-dose protection”
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8747942/