Pfizer and Moderna Could Mark the Start of a New Era in Vaccines

If approved, the companies’ Covid-19 vaccines would be the first of their kind

Photo: JOEL SAGET/AFP/Getty Images

Last week, drugmaker Pfizer and German biotech partner BioNtech announced that their Covid-19 vaccine was more than 90% effective in a clinical trial, sparking hope that an end to the pandemic may soon be achievable. More…