Repeated boosters of existing COVID-19 vaccines not a viable strategy against emerging variants: WHO advisers
GENEVA: WHO experts warned on Tuesday (Jan 11) that
repeating booster doses of the original COVID-19 vaccines is not a viable
strategy against emerging variants and called for new jabs that better protect
against transmission.
An expert group created by the World Health Organization
(WHO) to assess the performance of COVID-19 vaccines said simply providing
fresh jabs of existing COVID-19 vaccines as new strains of the virus emerge was
not the best way to fight the pandemic.
"A vaccination strategy based on repeated booster doses
of the original vaccine composition is unlikely to be appropriate or
sustainable," the WHO Technical Advisory Group on COVID-19 Vaccine
Composition (TAG-Co-VAC) said in a statement.
The group said there could be a need to update the existing
vaccines to better target emerging COVID-19 variants like Omicron, which has
spread rapidly and has been detected in 149 countries so far.
And it called for the development of new jabs that not only protect people who contract COVID-19 against falling seriously ill but also better prevent people from catching the virus in the first place.
PREVENT INFECTION
"COVID-19 vaccines that have high impact on prevention
of infection and transmission, in addition to the prevention of severe disease
and death, are needed and should be developed," TAG-Co-VAC said.
This, it said, would help lower "community transmission
and the need for stringent and broad-reaching public health and social
measures".
It also suggested that vaccine developers should strive to
create jabs that "elicit immune responses that are broad, strong, and
long-lasting in order to reduce the need for successive booster doses".
According to the WHO, 331 candidate vaccines are currently
being worked on around the world.
Until new vaccines have been developed, the group said,
"the composition of current COVID-19 vaccines may need to be
updated".
This would "ensure that (they) continue to provide
WHO-recommended levels of protection against infection and disease by VOCs
(variants of concern), including Omicron and future variants".
Just weeks after Omicron was first detected in southern Africa, it is becoming increasingly clear that it is not only far more transmissible than previous variants, but also better at dodging some vaccine protections.
The WHO has so far given its stamp of approval to versions
of eight different vaccines.
TAG-Co-VAC stressed that those vaccines provide a high level
of protection against severe disease and death caused by the various variants
of the virus.
It said preliminary data indicated the existing vaccines
were less effective at preventing symptomatic COVID-19 disease in people who
have contracted the Omicron variant.
But protection against severe disease, which is what the
jabs were especially intended to do, "is more likely to be
preserved", it said.
"However, more data on vaccine effectiveness,
particularly against hospitalization, severe disease, and death are needed,
including for each vaccine platform and for various vaccine dosing and product
regimens," it said.
"PRIMARY VACCINATION" TOP PRIORITY
In the meantime, TAG-Co-VAC echoed the WHO stance that
"the immediate priority for the world is accelerating access to the
primary vaccination".
The UN health agency has resisted the push in a growing
number of countries to roll out blanket booster programmes in the battle
against new concerning variants like Omicron.
The WHO says this makes no sense as many people in poorer
nations are still waiting for a first jab, dramatically increasing the chance
of new, more dangerous variants emerging.
So far, more than 8 billion doses of COVID-19 vaccines have
been administered in at least 219 territories, according to an AFP count.
But while more than 67 percent of people in high-income
countries have received at least one jab, fewer than 11 percent have in low-income
countries, according to UN numbers.
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