The infections occurred between one and two months after booster shots
A small study of seven Covid-19 cases in SA shows the Omicron variant can break through booster vaccine shots, one of the scientists involved said on Thursday.
Of the group, six were fully vaccinated with the Pfizer-BioNTech vaccine, of whom five had also had a booster Pfizer shot while the sixth had received a booster dose of the Moderna vaccine. A much bigger real world study of 581 people in Britain showed booster vaccines significantly restore protection against mild disease caused by the Omicron variant, in part reversing an otherwise steep drop in vaccine effectiveness, the UK Health Security Agency said last week.
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