The results come a day after UK Prime Minister Boris Johnson warned that two shots will not be enough to contain Omicron after the UK health authority found boosters significantly restore protection against the variant last week.
The Oxford study said there was still no evidence that lower levels of anti-infection antibodies to Omicron could result in a higher risk of serious illness, hospitalization, or death in those who received two doses of approved vaccines.
“This data is important, but only part of the picture. They don’t look at neutralizing antibodies until after the second dose, but they tell us nothing about cellular immunity, and this is also tested, “said Matthew Snape, Oxford professor and co-author of the paper.
(Reporting by Pushkala Aripaka in Bengaluru; editing by Sherry Jacob-Phillips and Shailesh Kuber)