91丝瓜视频

Dr. Timothy Evans, Inaugural Director and Associate Dean at the School of Population and Global Health and Executive Director of Canada's COVID-19 Immunity Task Force Secretariat is among the experts quoted by the Canadian Press. The story was widely covered in Canadian publications.

"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.

But the head of the government's COVID-19 Immunity Task Force says that the highly contagious Omicron variant may offer an "immune dividend" offering fresh protection against future infection."

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