Nation Pfizer says third dose of its vaccine offers protection against omicron: Latest COVID-19 updates December 8, 2021Jeanine Santucci and N'dea Yancey-Bragg, USA TODAYComments Off on Pfizer says third dose of its vaccine offers protection against omicron: Latest COVID-19 updates Three doses of the Pfizer-BioNTech COVID-19 vaccine provide more robust protection than two against the omicron variant. Latest updates.