There was talk about intranasal vaccines against Covid in 2020 already. But there was a catch: they need to be tested really, really well. Anything that gets s

There was talk about intranasal vaccines against Covid in 2020 already. But there was a catch: they need to be tested really, really well. Anything that gets snorted into your nose has a pretty short path to the brain, with potentially "interesting" results (cocaine, Naegleria fowleri etc.). So you have to be extra sure that your intranasal medication is harmless. As the article mentions, this particular vaccine has been developed for four years. That seems to be long enough to be sure. But I wouldn't be taking it back in 2021 or 2022.