A study has found that people who have been fully vaccinated or just recovered from Covid have virtually no antibody protection against the Omicron variant.
The Omicron subvariant, BA.2, is not only more transmissible than the original Omicron strain, BA.1, but may cause more severe disease, a lab study from Japan says.
Immunity from a previous COVID-19 infection provides less protection from reinfection against the Omicron variant than other coronavirus variants, according to a new study in the New England Journal of Medicine.