世界卫生组织于2021年11月26日将新冠病毒变异株B.1.1.529命名为奥密克戎，并将其列为需要关注的变异株1。该变异株携带多项可能影响其传播能力和疾病严重程度的突变1，但目前关于其具体传播性、对疾病严重程度的影响以及对现有疫苗有效性的具体影响仍在研究中1。
初步证据表明奥密克戎存在再感染风险增加的可能性1。世卫组织指出，现有疫苗仍对防止重症和死亡有效1，且PCR检测仍能检测奥密克戎感染1。为应对这一变异株，世卫组织建议各国加强监测和基因测序工作1。个人防护方面，建议保持至少1米的物理距离、佩戴贴合口罩、改善通风、保持手卫生并及时接种疫苗1。
The World Health Organization designated the SARS-CoV-2 variant B.1.1.529 as a variant of concern and named it Omicron on November 26, 2021 1. The variant carries multiple mutations with the potential to affect its transmissibility and disease severity, though the precise impact of these changes remains under investigation 1. While preliminary evidence suggests a possible increased risk of reinfection with Omicron, it remains unclear whether the variant's transmissibility exceeds that of Delta and other circulating strains 1.
Current vaccines continue to provide protection against severe disease and death from Omicron infection 1. Standard PCR testing remains effective for detecting the variant 1. The WHO advised countries to strengthen surveillance and genetic sequencing efforts while recommending individuals maintain physical distance of at least one meter, wear well-fitting masks, improve ventilation, maintain hand hygiene, and receive timely vaccination 1.
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