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 percent after six months. It also reported...