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As health authorities prepare for a new wave of COVID-19 this fall, a new variant of the coronavirus has arrived on the scene.
就在卫生部门为今年秋天新一波新冠肺炎疫情做准备之际，一种新型冠状病毒出现了。
The variant, called BA.5.2.1.7 or BF.7 for short, is an offshoot of the Omicron subvariant BA.5, which is currently the dominant SARS-CoV-2 variant in the US.
该变异毒株被命名为BA.5.2.1.7，简称BF.7，是奥密克戎变异毒株BA.5的一个分支，是目前在美国占主导地位的SARS-CoV-2变种。
The CDC is especially concerned about BF.7 because cases of it have been on the sharp rise in the US. over the past month,
美国疾病控制与预防中心高度关注BF.7变异株，因为在过去的一个月里，其病例在美国急剧上升，
having doubled from 0.8 percent to 1.7 percent in a span of just two weeks.
在短短两周内，其发病率从0.8%提高到了1.7%。
As of October 7, 2022, BF.7 accounted for 3.4 percent of all new COVID infections nationally.
截至2022年10月7日，BF.7病例占全美所有新感染病例的3.4%。
BF.7 appears to be more transmissible than Omicron and other circulating Omicron subvariants.
相比奥密克戎和其他现存的奥密克戎亚变种，BF.7变异毒株似乎更具传染性。
The severity of disease that BF.7 causes still remains unknown.
而BF.7变异毒株导致的疾病严重性目前仍是未知的。
But experts say it's likely to be similar to other Omicron subvariants, all of which have been similar in severity.
但专家称，很可能会与其他奥密克戎亚变种类似，所有亚变种在导致的疾病严重性上都差不多。
BF.7 was first reported by the CDC as part of BA.5 cases this summer.
美国疾病控制与预防中心对BF.7变异毒株的首次报告是在今年夏天，当时是作为BA.5的一个分支。
The health agency was compelled to place it in its own category recently when cases topped one percent.
而随着最近其发病率超过了1%，该卫生机构被迫将其归为单独的一个变异毒株。
While BF.7 has only gained momentum in the US in the past month, it has already taken a strong foothold in other countries.
尽管BF.7变异毒株病例在过去一个月才在美国出现了上扬势头，但在其他国家，它早已占据了主导地位。
Belgium currently has the majority of BF.7 cases worldwide at over 25 percent while Denmark, Germany and France have around 10 percent of the world's total cases.
在全球范围内的BF.7病例中，比利时目前占据大多数，占比超过了25%，而丹麦、德国和法国约占全世界总病例的10%。
The good news is that both Pfizer and Moderna now have bivalent mRNA vaccines designed to target both the original strain of the virus and Omicron, including the Omicron subvariants BA.4 and BA.5.
好消息是，辉瑞和莫德纳现在都有针对病毒原株和奥密克戎亚变种BA.4和BA.5的二价mRNA疫苗。
However, it is unknown exactly how effective they will be against BF.7 specifically.
但目前还不清楚这些疫苗对BF.7的效果究竟如何。
