What we know so far about the BA.2 subvariant

A second wave of Omicron is underway across the world driven by the BA.2 subvariant and now accounts for least 60% of new COVID-19 infections.1

The proportion of cases due to BA.2 in Australia varies between states and territories – but is as high as 70% in SA according to the state’s Chief Public Health Officer Professor Nicola Spurrier earlier this month – with almost all of the remainder due to BA.1. 

Interestingly, both BA.1 and BA.2 emerged simultaneously from Gauteng Province, South Africa, in late

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