WHO recommends new Covid-19 shots should target only XBB variants

GENEVA - A World Health Organisation (WHO) advisory group recommended on Thursday 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 neutralising antibody responses against XBB lineages could also be considered.

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 humans and shots targeting the strain produce “undetectable or very low levels of neutralising antibodies” against currently circulating variants.

Covid-19 vaccine makers such as Pfizer/BioNtech, Moderna and Novavax are already developing versions of their respective vaccines targeting XBB.1.5 and other currently circulating strains.

The United States Food and Drug Administration is also set to hold a meeting of outside experts in June to discuss the strain compositions of Covid-19 shots for later in 2023. Vaccine manufacturers will be expected to update their shots once the strains are selected.

The bivalent booster shots developed and distributed in 2022 targeted two different strains – the Omicron variant as well as the original virus.

WHO’s advisory group, which recommends if changes are needed to the composition of future Covid-19 shots, said currently approved vaccines should continue to be used in accordance with the agency’s recommendations.

In late March, WHO had revised its Covid-19 vaccination recommendations and suggested that healthy children and adolescents might not necessarily need a shot, but older and high-risk groups should get a booster between six and 12 months after their last vaccine.

The latest recommendations come about two weeks after WHO ended the global emergency status for Covid-19. REUTERS