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The Omicron variant can partially evade protection from two doses of Pfizer and partner BioNTech’s COVID-19 vaccine, the research head of a laboratory at the Africa Health Research Institute in South Africa said.
But the study showed that blood from people who had received two doses of the vaccine and had a prior infection was mostly able to neutralize the variant, suggesting that booster doses of the vaccine could help to fend off infection.
Alex Sigal, a professor at the institute, said on Twitter there was “a very large drop” in the neutralization of the Omicron variant relative to an earlier strain of COVID-19.
A separate lab test by virologist Sandra Ciesek of the University Hospital Frankfurt painted a somewhat bleaker picture.
Exposing the blood of vaccinated individuals to different virus variants, she found that the ability to mount an antibody response to Omicron in people who had three shots of BioNTech/Pfizer was up to 37 times lower than the response to Delta.
An antibody response to Omicron half a year after a two-shot regimen of Pfizer/BioNTech, Moderna or a mixed course of AstraZeneca/BioNTech was not even measurable, Ciesek added.
She posted only selected findings on Twitter and the university said the paper had not yet been published.
“The set of data underscores that it makes sense to develop a vaccine that is adapted to Omicron,” Chiesek tweeted, adding that no conclusion could be drawn about protection against severe disease.
The Omicron variant, first detected in southern Africa last month, has triggered alarms globally of another surge in infections, with more than two dozen countries from Japan to the United States reporting cases.
The World Health Organization classified it on Nov. 26 as a “variant of concern,” but said there was no evidence to support the need for new vaccines specifically designed to tackle the Omicron variant with its many mutations.
Sigal’s lab tested blood from 12 people who had been vaccinated with two doses of the Pfizer/BioNTech vaccine, according to a manuscript posted on the website for his lab. The preliminary data in the manuscript has not yet been peer-reviewed.
Blood from five out of six people who had been vaccinated as well as previously infected with COVID-19 still neutralized the Omicron variant, the manuscript said.
“These results are better than I expected. The more antibodies you got, the more chance you’ll be protected from Omicron,” Sigal said on Twitter.
He said the lab had not tested the variant against blood from people who had received a booster dose, because they are not available in South Africa yet.
According to the manuscript, the lab observed a 41-fold decline in levels of neutralizing antibodies against the Omicron variant.
Sigal said on Twitter that figure is likely to be adjusted after his lab does more experiments.
While neutralizing antibodies are an indicator of the body’s immune response, scientists believe other kinds of cells such as B-cells and T-cells are also stimulated by the vaccines and help protect against the effects of the coronavirus.
The preliminary data does not indicate that the vaccine is less able to prevent severe illness or death. While lab tests are under way, BioNTech CEO Ugur Sahin said last week “we think it’s likely that people will have substantial protection against severe disease caused by Omicron”.
There is not significant data yet on how vaccines from Moderna, Johnson & Johnson and other drugmakers hold up against the new variant. All the manufacturers, including Pfizer and BioNTech, are expected to release their own data within weeks.
BioNTech’s Sahin told NBC News on Tuesday that the drugmaker has data coming on Wednesday or Thursday.
Top U.S. infectious disease expert Dr. Anthony Fauci said on Tuesday that preliminary evidence indicates that Omicron likely has a higher degree of transmissibility but is less severe.
He said the United States was doing its own tests to determine the protectiveness of the current vaccines and expects results sometime next week.
Umer Raffat, an analyst for Evercore ISI, cautioned against reading too much into a single study, noting there has been significant variability in measuring declines in antibody levels in previous lab studies.
Till now, the Omicron variant has been reported in 57 nations and the number of patients needing hospitalisation is likely to rise as it spreads, the World Health Organization said on Wednesday.
The WHO, in its weekly epidemiological report, said more data was needed to assess the severity of disease caused by the Omicron variant and whether its mutations might reduce protection from vaccine-derived immunity.
“Even if the severity is equal or potentially even lower than for Delta variant, it is expected that hospitalisations will increase if more people become infected and that there will be a time lag between an increase in the incidence of cases and an increase in the incidence of deaths,” it said.
On Nov. 26, the WHO declared the Omicron variant, which was first detected in southern Africa, a variant of concern. It is the fifth SARS-CoV-2 strain to carry such a designation.
The number of reported COVID-19 cases in South Africa doubled in the week to Dec. 5 to more than 62,000 and “very large” increases in incidence have been seen in Eswatini, Zimbabwe, Mozambique, Namibia and Lesotho, it said.
The spread of Omicron, coupled with enhanced testing and low vaccination rates may have played a role, it added.
Referring to the risk of reinfection, the WHO said: “Preliminary analysis suggests that the mutations present in the Omicron variant may reduce neutralising activity of antibodies resulting in reduced protection from natural immunity.”
“There is a need for more data to assess whether the mutations present on the Omicron variant may result in reduced protection from vaccine-derived immunity and data on vaccine effectiveness, including the use of additional vaccination doses,” it said.
The Omicron variant can partially evade the protection from two doses of the COVID-19 vaccine produced by Pfizer Inc and BioNTech, the research head of a laboratory at the Africa Health Research Institute in South Africa said on Tuesday, reporting the results of a small study.
REUTERS
