Tests using antibodies in blood samples have given some of the first insights into how far Omicron escapes immunity, showing a stark drop-off in the predicted protection against infection or disease for people who have had two doses. The findings suggest that, for Omicron, Pfizer/ BioNTech should now be viewed as a three-dose vaccine.
The vaccine makers said they would continue at full speed with plans to develop an updated Omicron-based vaccine by March 2022.
Separate results, from preliminary studies by the German Center for Infection Research, also found significant reductions in antibody potency for Pfizer/BioNTech, Moderna and Oxford/AstraZeneca vaccines.
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