根据美国疾病控制与预防中心周二发布的估计，上周美国 95.4% 的新 Covid-19 病例是由 Omicron 变体引起的——明显高于前一周。
在过去的四个星期中，Omicron 的估计值迅速上升，原因如下：
截至 12 月 11 日当周的病例数为 8.0%
截至 12 月 18 日当周的病例数为 37.9%
截至 12 月 25 日当周的病例数为 77.0%
截至 1 月 1 日的那一周，95.4% 的病例
Delta 变体几乎占了其余部分。
注意：并非每个 Covid-19 测试都会发送额外的基因测序，以检测哪个变体感染了某人。 CDC 计算样本并根据额外的测试推断其估计值。
Omicron now accounts for 95% of new US Covid-19 infections
The Omicron variant caused 95.4% of new Covid-19 cases in the US last week – significantly higher than the previous week, according to estimates posted Tuesday by the US Centers for Disease Control and Prevention.
Over the past four weeks, Omicron has risen rapidly in estimates, accounting for:
8.0% of cases the week ending Dec. 11
37.9% of cases the week ending Dec. 18
77.0% of cases the week ending Dec. 25
95.4% of cases the week ending Jan. 1
The Delta variant makes up nearly all of the rest.
Note: Not every Covid-19 test is sent for the extra genetic sequencing needed to detect which variant has infected someone. The CDC works off samples and extrapolates its estimates based on that extra testing.
