It is categorically impossible to know exactly when an effective vaccine will be available in advance. Anyone who says otherwise is pulling the wool over your eyes 1/n
sure you can have a pretty good idea of when enough data will have been collected to get a read on how effective the vaccine is, but you don& #39;t know in advance what the data are going to tell you 2/n
It might be good news, it might be bad, it might be mixed (eg good in some age groups, others not so much). Unless there has been a dreadful breakdown in all the things we do to make trials secure and reliable, you won& #39;t know until the data are analyzed 3/n
Among those things that ensure reliability is thoroughly investigating adverse events. Doing this is a Good Thing. We need to ensure vaccines are safe. However it will delay things such that again, it& #39;s not predictable exactly when results will be available 4/n