At a global level, the proportion of reported sequences designated BA.2 has been increasing relative to BA.1 in recent weeks, however the global circulation of all variants is reportedly declining.
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BA.2与BA.1的基因序列不同，包括刺突蛋白和其他蛋白中的一些氨基酸差异。
BA.2 differs from BA.1 in its genetic sequence, including some amino acid differences in the spike protein and other proteins.
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研究表明，BA.2比BA.1更具增长优势。
Studies have shown that BA.2 has a growth advantage over BA.1.
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目前正在开展研究以了解这种增长优势的原因。
Studies are ongoing to understand the reasons for this growth advantage, but initial data suggest that BA.2 appears inherently more transmissible than BA.1, which currently remains the most common Omicron sublineage reported.
This difference in transmissibility appears to be much smaller than, for example, the difference between BA.1 and Delta.
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这一传播力差异似乎远远小于BA.1与德尔塔之间的差异。
Further, although BA.2 sequences are increasing in proportion relative to other Omicron sublineages (BA.1 and BA.1.1), there is still a reported decline in overall cases globally.