Washington: Antibodies produced by two-doses of mRNA vaccines against the original and early variants of the SARS-CoV-2 virus wane substantially over time, and offer essentially no protection against Omicron, according to a study that highlights the importance of a booster dose.
...Covid vaccine-induced antibodies don’t protect vs Omicron: Study
In a previous study, which is yet to be peer-reviewed, the same research team found that a third COVID-19 mRNA vaccine booster dose produced effective levels of neutralising antibodies against Omicron.