 First of all, Oxford University has been developing one to be distributed by AstraZeneca. AstraZeneca had to halt its program a couple months ago. It looks like they're geared up to do it again. You'll have to take two doses for it to be effective, and right now it's up to 90% effective, they say. Moderna, that's the other one, but that deals with the genetic code of the RNA. You'll have to take two vaccines for that.