[blakesterz]

MIT looks like they're trying inhaled vaccines for cancer: https://news.mit.edu/2021/vaccination-inhalation-0319

And several others are looking at CoV too: https://pubmed.ncbi.nlm.nih.gov/33749491/

I guess nasal vaccines have been around for a while but the inhaled thing is still pretty new(ish) and from what I could read on some scattered short mentions in other reading, it's not really very widely used? I may be wrong on that, and can't find a great citation.