A World Health Organisation (WHO) advisory group on Thursday (May 18) recommended that this year's Covid-19 booster shots be updated to target one of the currently dominant XBB variants. New formulations should aim to produce antibody responses to the XBB.1.5 or XBB.1.16 variants, the advisory group said, adding that other formulations or platforms that achieve neutralizing antibody responses against XBB...
A man wearing a protective face mask walks past an illustration of a virus outside a regional science centre, in Oldham, Britain on Aug 3, 2020.A World Health Organisation advisory group on Thursday recommended that this year's Covid-19 booster shots be updated to target one of the currently dominant XBB variants.
The group suggested no longer including the original Covid-19 strain in future vaccines, based on data that the original virus no longer circulates in human beings and shots targeting the strain produce "undetectable or very low levels of neutralizing antibodies" against currently circulating variants.
The bivalent booster shots developed and distributed last year targeted two different strains - the Omicron variant as well as the original virus.
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