The data at VAERS is user-added, and subject to manipulation. This isn't aimed at you because I don't even know if you're anti-vaxx or not, but at the use of VAERS to support anything anymore, even if you could at one time.
As 2021 shambles to a close, the misuse of VAERS by antivaxxers continues apace
I’ve discussed why the idea that VAERS is the be-all and end-all of vaccine safety monitoring is wrong on a number of occasions, but I always like to preface such remarks by simply noting something about discussions of VAERS by antivaxxers. Notice how antivaxxers always cite VAERS and only rarely, if ever, cite other, much better and more reliable, vaccine safety monitoring databases, such as the Vaccine Safety Datalink (
VSD), the Clinical Immunization Safety Assessment (
CISA) project, or FDA’s Post-licensure Rapid Immunization Safety Monitoring System (
PRISM) Antivaxxers also seem to like to represent VAERS simultaneously as the best system to find adverse events (AEs) from vaccines, even while also claiming it’s awful due to underreporting (as above), which means (to them) that all the horrible things in VAERS are really a lot more common than “they” want you to think.
VAERS is, of course, what is known as a passive reporting system in that it relies on doctors, nurses, healthcare workers,
and, yes, people receiving vaccines (or their families) to report AEs after vaccines. As a system, it was never intended to provide an accurate estimate of the frequency of AEs related to vaccines, but rather to serve as an early warning system, a “canary in the coal mine”, if you will, for possible new vaccine-related AEs. In other words,
VAERS is a hypothesis-generating, not a hypothesis testing, system, and its hypotheses are tested using better systems, like VSD, CISA, and PRISM. In contrast to VAERS, these systems are active reporting systems in that electronic health records are actively monitored for AEs after vaccination in order to identify potential signals; there is a lot less bias that way and a lot less potential for misreporting.
But back to VAERS.
The main problem with using VAERS to estimate the frequency of AEs after vaccination is that, in essence, anyone with access to the Internet, mail, or the telephone can report anything to VAERS, as was demonstrated by bloggers years and years ago when one autism advocate filed a report claiming that the flu vaccine had
turned him into The Incredible Hulk and another claimed a vaccine had
turned his daughter into Wonder Woman. Both reports were accepted. In fairness, ultimately someone from VAERS did contact these people to ask about the reports, and the reports were removed. However, had they refused, reports that vaccines might turn one into the Hulk or Wonder Woman might still be in the database.
In any event, this particular criticism, that anyone can enter anything into VAERS, clearly rankles antivaxxers...