NEW YORK: Pfizer Inc. and BioNTech SE announced the start of a global (except for China) Phase 2/3 safety and efficacy clinical study to evaluate a single nucleoside-modified messenger RNA (modRNA) candidate from their BNT162 mRNA-based vaccine program against SARS-CoV-2. After extensive review of preclinical and clinical data from Phase 1/2 clinical trials, and in…