More people died in the key clinical trial for Pfizer's Covid vaccine than the company publicly reported

Pfizer told the world 15 people who received the vaccine in its trial had died as of mid-March. Turns out the real number then was 21, compared to only 17 deaths in people who hadn't been vaccinated.

On July 28, Pfizer and its partner BioNTech posted a six-month data update from their key Covid vaccine clinical trial, the one that led regulators worldwide to okay the shot.

At a time when questions about vaccine effectiveness were rising, the report received worldwide attention. Pfizer said the vaccine’s efficacy remained relatively strong, at 84 perc…