Comparable safety and non-inferior immunogenicity of the SARS-CoV-2 mRNA vaccine candidate PTX-COVID19-B and BNT162b2 in a phase 2 randomized, observer-blinded study oleh Lawrence Reiter, Johann Greffrath, Bian Zidel, Mario Ostrowski, Jennifer Gommerman, Shabir A. Madhi, Richard Tran, Natalia Martin-Orozco, Rajesh Krishnan Gopalakrishna Panicker, Curtis Cooper, Aleksandra Pastrak