Nation Pfizer developing vaccine to target omicron; unvaccinated make up most of NY breakthrough infections: COVID-19 updates January 11, 2022 Celina Tebor and N'dea Yancey-Bragg, USA TODAY Comments Off on Pfizer developing vaccine to target omicron; unvaccinated make up most of NY breakthrough infections: COVID-19 updates Pfizer's CEO Albert Bourla said developing a COVID vaccine specifically designed to target omicron is "the most likely scenario." Latest news.