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Well they might do what a lot of countries are doing with the AZ one and restrict it to people over a certain age since most cases of blood clots have been in younger people.
It seems that vaccines based on inactivated andenovirus vectors might be causing rare immune responses to platelet factor IV that causes the issue.
That is what is likely to happen. I mentioned this over in the other thread that is in Hot Topics- the affected patients who received Janssen/J&J in the US were female and between age 18 and 48; and it is 6 cases out of 7 million doses that were administered which is far less risk of complications than is seen with vaccines that have been in use for decades.
These vaccines were all approved under emergency use authorizations and they are being monitored very closely for side affects and risks. Every incident is being documented, so that's why we're seeing these incidents being acted upon very quickly.
They will probably find that there was some other risk factor (e.g. smoking, birth control, clotting abnormality) and they will likely continue to use the vaccine in populations that do not have these risk factors.

