Omicron Could Boost Waning Immunity, Shown in Blood: Gov’t COVID 19 Advisers

Omicron Could Boost Waning Immunity, Shown in Blood: Gov’t COVID 19 Advisers
A bag of blood is shown at a clinic in Montreal, November 29, 2012. The Canadian Press/Ryan Remiorz
The Canadian Press
Updated:

OTTAWA—Immunity against COVID-19 among vaccinated adult Canadians and those who have already contracted the virus has been waning throughout the population, tests on donated blood have found.

Tests on around 9,000 donated blood samples from across Canada show that antibodies in the blood which fight the virus declined in October among all age groups, with experts saying the waning immunity is likely to have continued in November and December.