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COVID Vaccine Booster Provides Effective Antibody Protection Against Omicron: Lancet Study
The third dose of the COVID-19 vaccine increases the level of antibodies that can effectively neutralise the Omicron variant of coronavirus, according to a study published in The Lancet journal. Researchers from Francis Crick Institute and the National Institute for Health Research (NIHR), UK, found that antibodies generated in people who had received only two doses of either the AstraZeneca or the Pfizer vaccine were less able to neutralise Omicron as compared to Alpha and Delta variants.
They also found that antibody levels dropped off in the first three months following the second dose but a third 'booster' dose raised levels of antibodies that effectively neutralise the Omicron variant.
The study found that in people who had received the Pfizer vaccine for all three doses, antibody levels against Omicron after a third dose were similar to those previously reached against Delta after only two shots.
Overall, antibody levels were nearly 2.5 times higher against Omicron after three doses compared to after two jabs, according to the researchers.
Higher levels of antibodies against Omicron were also found in people who received two doses of either vaccine and also reported previously having COVID-19 symptoms, compared to those who didn't have disease symptoms in past.
While levels of antibodies alone do not predict vaccine effectiveness, they are a very good indicator of protection against severe COVID-19, the researchers noted.
The study confirms that three doses of the COVID-19 vaccine are essential to boost antibodies to quantifiable levels and maximise the amount of protection against severe disease and hospitalisation.
"People who have queued outside vaccinations centres should be reassured that a vaccine booster is the best way of protecting them from Omicron," said Emma Wall, an infectious diseases consultant at UCLH Biomedical Research Centre of NIHR.
"And for people who haven't yet had a booster or even a first dose, it's not too late," Emma said in a statement.
The researchers analysed 620 blood samples from 364 people who enrolled in the study.
They
tested
the
ability
of
antibodies
to
block
entry
of
the
virus
into
cells,
so-called
'neutralising
antibodies',
against
different
variants
of
SARS-CoV-2,
including
Omicron.
The
researchers
also
included
synthetic
neutralising
antibodies
that
are
currently
in
use
for
COVID-19
treatment
to
test
if
they
have
neutralising
activity
against
variants
of
SARS-CoV-2.
The team found that Xevudy (sotrovimab), a recently-approved synthetic monoclonal antibody used to prevent and treat patients at risk of developing severe COVID-19, was able to neutralise the Omicron variant.
"We have really important early data to suggest that at least some versions of synthetic antibodies that we currently use to treat certain patients, are likely to be effective against this new variant," Bryan Williams, UCLH Director of Research, added.
David LV Bauer, from Francis Crick Institute, said while Omicron has considerably more mutations than other recent variants, such as Alpha and Delta, the study shows that the boosters push the immune system to make a broad response capable of tackling it.
"This new variant can overcome the immune blockade put in place by two vaccine doses, but thankfully following the third dose, neutralising activity is robust in the vast majority of people," Wall said.
"A third dose builds our defences higher, making it harder for the virus to cause severe COVID-19," she explained.
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