工作队发现，超过1700万加拿大人在短短五个月内感染了Omicron

对21项研究的数据的分析表明，在短短五个月内，超过1700万加拿大人感染了Omicron变体。

“Omicron has been a tsunami,” COVID-19 Immunity Task Force (CITF) executive director Dr. Tim Evans said in a media release Wednesday morning.

“Across the country, our analysis of the data suggests that 17 million Canadians had an Omicron infection in the period December to May, for an average of more than 100,000 infections per day.”

Evans said because new sublineages in the Omicron line have continued to spread since then, the percentage of Canadians who have had a SARS-CoV-2 infection is now likely “well above 50%.”

The data analysis of 21 studies was funded by the federal government through CITF and relied on blood testing. The results were published in a新的CITF报告titled ‘Seroprevalence against SARS-CoV-2 due to infection in Canada’ and included data received up to May 31.

在Omicron到来之前，约有7％的加拿大人对导致COVID-19的病毒获得了感染获得的抗体。在2021年12月（Omicron Wave出现）和2022年5月之间，该数字攀升了45％。

Atlantic Canada had largest relative increase

The report found the number of people with signs of a previous infection in their blood (infection-acquired seroprevalence) increased significantly during the Omicron wave in every province.

到5月底，西部和中部省份有先前感染证据的人比例为50％至60％。

该版本指出：“尽管加拿大大西洋保留了由于感染引起的最低血清阳性，但血清阳性的相对增加最大，达到了35％以上。”

Younger, less vaccinated most affected

While Omicron affected all ages, researchers found that younger and less vaccinated populations were the most impacted. Analysis of blood donations made to Canadian Blood Services and shared with CITF showed highest seroprevalence due to infection was in young adults —about 65% had antibodies by the last week of May.

The older the population group, the more the rates of seropositivity due to infection dropped. In Canadians 25 to 39, it was 57%. For those in the 40 to 59 age group, it was 51%. In the population of Canadians 60 and older, it was 31%.

“通过大量的感染，Omicron变体对服务和生活的破坏以及住院和死亡造成了重大损失。显然，这并不能保留健康的加拿大年轻人。

“同样，我们仍在学习谁获得了Covid-19的状况或长期兴声，原因和后果。今年夏天可能没有公共卫生的限制，但是Omicron仍在蔓延，因此掩盖和距离在风险的环境中是明智的。为了最大程度地减少对我们生活的进一步破坏，加拿大必须随着进化的发展而紧密地跟踪情况。我们所有人都需要及时做出反应，因为这种病毒没有季节性模式，就像当每个人都在秋天回去上班或上学时，我们期望的其他呼吸道病毒。”

Most are at risk of re-infection

Task force co-chair Dr. David Naylor said while millions of Canadians now have hybrid immunity from being vaccinated and having acquired a COVID-19 infection, emerging evidence suggests most remain at risk of re-infection with viruses in the Omicron lineage.

“Newer vaccines may improve coverage against infection. However, we still have millions of adults who haven’t had a third shot and should get one to consolidate their protection against serious disease,” Naylor said.

“更一般而言，所有加拿大人都应保持警惕，以获取有关Covid-19-19疫苗的最新公共卫生指南，并确保其覆盖范围是秋季的最新情况。”

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