I strongly recommend making Derek's "In The Pipeline" column a regular read, because he provides the information that answers your question. First, there are t

I strongly recommend making Derek's "In The Pipeline" column a regular read, because he provides the information that answers your question. First, there are the number of people who would take the thing. Alzheimer's is terrible, but I think many more people would take a COVID-19 vaccine than have Alzheimer's. A drug that causes problems in 0.1% of people is treated differently when the population size is 29.8 million[0] people of advanced age vs. 7.8 billion people[1] of all ages. Second, the FDA has more than one advisory committee[2]. Which makes sense; I don't expect the world expert on CPAP and BiPAP machines to also be the world export on COVID-19 vaccines. [0]: https://en.wikipedia.org/wiki/Alzheimer's_disease#cite_note-GBD2015Pre-8 https://en.wikipedia.org/wiki/Alzheimer's_disease#cite_note-... [1]: https://www.worldometers.info/world-population/ https://www.worldometers.info/world-population/ [2]: https://www.fda.gov/advisory-committees https://www.fda.gov/advisory-committees