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I don't see why the USA or Canada can't do what NZ did. If you are serious about stopping travel into the country by closing the border to travellers - and actually quarantining the residents who come back home - then you only have the relatively minor flow of illegal land crossing. Neither Canada nor the US have even tried.

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This article is about zero COVID. “Relatively minor flow” (btw I’m not convinced it’s even minor...) means you never eradicate the virus (which is why I oppose the idea of zero covid categorically)

The outbreak in Victoria in May-Sep 2020 was the source of the majority of all COVID cases in Australia.

Sharing a land border with Victoria did not make it impossible for New South Wales or Victoria to get back to zero - and that's states, not countries, so the extent of the border infrastructure is a few "Welcome to Victoria" signs.

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