Tests performed on approximately 9,000 donated blood samples across Canada shows that immunity against COVID has waned since October but Omicron can boost protection against symptom severity.
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.
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.