Moderna Vaccine Follows Pfizer with Very Strong Results on Effectiveness: What This Means

Last week, we got the very good news that preliminary results from its Phase 3 trial showed that Pfizer’s vaccine had an effectiveness rate of 92 percent. (We now have final results that put it at 95 percent.) This week, Moderna released results showing that its vaccine also has a 95 percent effectiveness rate. In both cases, the companies reported a relatively small number of instances of adverse effects, which were in almost all cases minor (e.g. headaches or sore arms).

It was great to hear t...