WM, I was going to say the same but writing it on my mobile at the end of the night was a step too far.
When I had a look at vaccine development processes I saw that normal procedure is for the manufacturer to follow up with test candidates for several years to ensure that no other complications arise and that the vaccine didn't create any other impact on pre existing conditions.
With hundreds of people dying daily, it is hardly right to insist on these conditions before we can release. However, by shortening our own requirements, we have to indemnify the companies if the longer term impacts are felt.
As it is highly unlikely the vaccine will be mandatory, the barrier to approval is lower. Also there is very little need to give the vaccine to children, where many vaccine adverse reactions are found.