The Omicron variant became the dominant variant infecting both vaccinated and the unvaccinated persons in many countries just one month after the World Health Organization designated it a variant of concern on November 26, 2021. Two months since, Omicron has become the dominant variant in every country that is witnessing a new wave. In short, Omicron has replaced the Delta variant, which was considered highly transmissive in almost every country across the world.
One of the defining features of a new variant is the higher transmissibility than the existing variant. If the Delta variant was found to be highly transmissible when compared with the Alpha variant, the Omicron variant has been found to be extremely transmissive when compared with the Delta variant.
