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Two-dose vaccines induce lower antibodies against Omicron, study finds

Two-dose COVID-19 vaccine regimens do not induce enough neutralising antibodies against the Omicron coronavirus variant, British scientists found, indicating that increased infections in those previously infected or vaccinated may be likely.

Researchers from the University of Oxford published results on Monday from a study yet to be peer-reviewed, where they analysed blood samples from participants who were given doses from AstraZeneca-Oxford (AZN.L) or Pfizer-BioNTech (PFE.N)(22UAy.DE) in a large study looking into mixing of vaccines.

The results come a day after British Prime Minister Boris Johnson warned that two shots will not be enough to contain Omicron, following findings from the UK health agency last week that boosters significantly restore protection against the variant. read more

The Oxford study said that there was no evidence yet that the lower level of infection-fighting antibodies against Omicron could lead to higher risk of severe disease, hospitalisation or death in those who have got two doses of approved vaccines.

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