Following a recent string of emergency use authorizations (EUA) for their jointly developed COVID-19 vaccine, BNT-162b2, Pfizer Inc. and Biontech SE said Dec. 14 that results from an ongoing German trial have helped illustrate "the multiple arms of the immune system that are activated" by the product to fight SARS-CoV-2. Separately, Moderna Inc. raised to 200 million the number of doses of its COVID-19 vaccine candidate it will supply to the U.S. government.