That doesn't sound right. Perhaps there could be a stream of vaccines rather than a one-off. Also, if you can get enough people vaccinated at one time to provi

That doesn't sound right. Perhaps there could be a stream of vaccines rather than a one-off. Also, if you can get enough people vaccinated at one time to provide herd immunity, perhaps it wouldn't be necessary to have long-term immunity, as the pandemic could be ended there and then.