4 ms·

Moderna's phase 3 includes preliminary data on a single dose, and it appears 80-90% effective at/after two weeks. See table 15 on page 28: https://www.fda.gov/

• mercurywells 6y ago
  From the same report: > The small, non-random sample and short median follow-up time limits the interpretation of these results. There appears to be some protection against COVID-19 disease following one dose; however, these data do not provide sufficient information about longer term protection beyond 28 days after a single dose. Obviously it'd be great if we can just dose everyone we can once then do a 2nd dose later, but we just don't know enough about how well that would work out long term.