May 17, 2021
A long-standing private organization, the National Vaccine Information Center  , has analyzed the US government’s database, the Vaccine Adverse Event Reporting System (VAERS).
As of May 7, 2021, VAERS lists 192,954 adverse-event reports associated with COVID vaccines. 
These events cover the spectrum from mild transient effects to death.
VAERS has always has multiple problems.
One: Doctors aren’t required by law to report adverse effects. Many of them wouldn’t risk blowback by doing so.
Two: There is no comprehensive effort to determine whether an adverse effect is actually caused by a vaccine.
Three: Patients can make adverse-effect reports—but are often hesitant to do so.
Four: By far the biggest problem is: most Americans aren’t even aware that VAERS exists.
Therefore, on balance, UNDER-REPORTING adverse effects is the primary defect of VAERS.