Where did Australia’s first cases of the Covid Delta variant come from and how infectious is it?

Victorian health authorities are concerned about the recent spread of the more infectious Covid strain, first identified in India, in the community

Two members of a West Melbourne family who visited New South Wales last month before testing positive for Covid-19 have been found to have the Delta variant of Covid-19.

It’s the second time the variant – first identified in India – has been found in the community in Australia, following a Sydney couple testing positive in May.

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source https://www.theguardian.com/australia-news/2021/jun/04/where-did-australias-first-cases-of-the-delta-variant-come-from-and-how-infectious-is-it