WHO recommends new COVID-19 shots should target only XBB variants
A World Health Organization (WHO) advisory group on Thursday 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 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 human beings and shots targeting the strain produce "undetectable or very low levels of neutralizing antibodies" against currently circulating variants.
COVID-19 vaccine makers like Pfizer/BioNtech, Moderna Inc and Novavax Inc are already developing versions of their respective vaccines targeting XBB.1.5 and other currently circulating strains.
The U.S. 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 this year; vaccine manufacturers will be expected to update their shots once the strains are selected.
The bivalent booster shots developed and distributed last year 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 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.
CTVNews.ca Top Stories

Speaker's Nazi veteran invite 'profoundly embarrassing' Trudeau says, as Rota faces calls to resign
Tensions flared in the Commons on Monday over opposition calls for House Speaker Anthony Rota to resign after apologizing to Parliament for inviting, recognizing and leading the chamber in a standing ovation for a man who fought for a Nazi unit during the Second World War.
Poster advertising 'whites-only' children's playtime sparks outrage in B.C. community
Police have launched an investigation into a poster inviting "proud parents of European children" to participate in racially segregated playtime in B.C.'s Lower Mainland.
Canadian air force investigating 'inappropriate and unapproved' call sign broadcast on U.K. flight
The Royal Canadian Air Force (RCAF) is investigating an ‘inappropriate and unapproved’ call sign that was transmitted electronically from one of its aircraft on Monday.
'Deeply hurtful': Polish ambassador condemns Nazi veteran’s invitation to Canada’s Parliament
Polish ambassador to Canada says House Speaker Anthony Rota's apology doesn’t go far enough after a Nazi veteran was honoured in the House of Commons last Friday.
7 candidates have qualified for the 2nd Republican presidential debate. Here's who missed the cut
The field for the second Republican presidential debate will be smaller than the first.
Vaccination during pregnancy safe, effective and recommended, CMAJ says
The most up-to-date guidelines from the Canadian Medical Association Journal recommend the COVID-19 vaccine for anyone who is pregnant in order to reduce the risk of serious illness to themselves and the children they carry.
Canadian Sikhs stage protests against Indian government over murder
Canadian Sikhs staged small protests outside India's diplomatic missions on Monday, a week after Prime Minister Justin Trudeau said there may be a link between New Delhi and the murder of a Sikh separatist advocate in British Columbia.
An airsoft pistol, a machete, and 2 knives: Jury learns of items seized in pickup truck used during attack on a London, Ont. family
The trial of Nathaniel Veltman, 22, continued in Windsor for his actions on June 6, 2021 that killed four people and seriously injured a fifth person. In court on Monday, two forensic identification officers with the London Police Service testified.
Canada approves Ebola virus vaccine for adults exposed to the deadly disease
Canada has approved a vaccine to prevent Ebola in non-pregnant and otherwise healthy adults aged 18 and older.