There is nothing to hide if there is no data collected in the first place. Here in this video, you can see that even injuries sustained by people who took part in the trials are being rejected by the doctors citing as caused by "anxiety".

https://www.youtube.com/watch?v=6mxqC9SiRh8

I think people are completely oblivious to this issue, and is under this fallacy that if there was something wrong with the vaccines, then the information will automatically appear in public perception. If you think this, you need to only look at how smoking went on for a long time without the people noticing any problem with it.

With vaccines, we know that the signal is killed right at the point of generation, because the medical practicioners are conditioned (being charitable here) to reject any injury as not being caused by the Vaccines.

AstraZeneca has not been approved in the US because of potential blood clot risks.

Nearly 2 billion people have been vaccinated against COVID-19, including >150 million people in the US, and hundreds of millions in the EU. There are very few adverse reactions, and no deaths. The risks of COVID-19 injury and death are far higher.