All three COVID-19 vaccines approved in the United States are ineffective against omicron mutation, and a study result was published on the 14th local time that the protective effect was restored only when a booster shot was administered.
According to Reuters, researchers from Massachusetts General Hospital (MGH), Harvard University and the Massachusetts Institute of Technology (MIT) tested the Omicron mutation and the Immune responses to a similarly engineered hypothetical virus were examined.
As a result of the analysis, the blood of those who completed the vaccination with two doses of Pfizer and Moderna and one dose of Janssen vaccine showed no or low neutralizing levels of antibodies to the Omicron mutation.
On the other hand, the blood of people who had recently received a booster shot showed a strong neutralizing reaction to the omicron mutation, the researchers found.
Scientists participating in the study, which has not yet been peer-reviewed, also suggested that the omicron mutation is more contagious than the existing COVID-19 virus, showing that it is twice as contagious as the delta mutation.
The results of these studies are similar to the results of previous studies that showed that the immune effect on omicron mutations was reduced even after the previous vaccination was completed.
Previously, researchers at Oxford University in England published a study on the 13th that showed that two doses of the Pfizer and AstraZeneca vaccines did not produce a sufficient neutralizing reaction against the Omicron mutation.
BioNtech and Pfizer also announced last week that only two doses of vaccination produced a remarkably low level of neutralizing antibody that neutralizes Omicron, and that three doses of vaccine were required to neutralize Omicron mutation.