There is a major quality control issue. There were leaked emails from European Medicines Agency, or EMA, discussing this. I bet that's what we are seeing in the VAERS data.

https://www.bmj.com/content/372/bmj.n627

Quote:

As it conducted its analysis of the Pfizer-BioNTech covid-19 vaccine in December, the European Medicines Agency (EMA) was the victim of a cyberattack.1 More than 40 megabytes of classified information from the agencys review were published on the dark web, and several journalistsincluding from The BMJand academics worldwide were sent copies of the leaks. They came from anonymous email accounts and most efforts to interact with the senders were unsuccessful. None of the senders revealed their identity, and the EMA says it is pursuing a criminal investigation.

The BMJ has reviewed the documents, which show that regulators had major concerns over unexpectedly low quantities of intact mRNA in batches of the vaccine developed for commercial production.

EMA scientists tasked with ensuring manufacturing qualitythe chemistry, manufacturing, and control aspects of Pfizers submission to the EMAworried about "truncated and modified mRNA species present in the finished product." Among the many files leaked to The BMJ, an email dated 23 November by a high ranking EMA official outlined a raft of issues. In short, commercial manufacturing was not producing vaccines to the specifications expected, and regulators were unsure of the implications. EMA responded by filing two major objections with Pfizer, along with a host of other questions it wanted addressed.

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