In der US Nebenwirkungsdatenbank findet sich zu Thema "underreporting" folgender Beitrag.:
"Adverse events from drugs and vaccines are common, but underreported. Although 25% of ambulatory patients experience an adverse drug event, less than 0.3% of all adverse drug events and 1-13% of serious events are reported to the Food and Drug Administration (FDA). Likewise, fewer than 1% of vaccine adverse events are reported."
https://openvaers.com/faq/what-is-underreporting-and-why-it-matters