Australia, which has been pursuing a “zero-Covid” policy for a year, may open to overseas tourists by 2022 – but possibly only to those who have been vaccinated. The prime minister, Scott Morrison, told reporters: “I think it is a reasonable expectation that as time goes on, as the vaccination rolls out across the world and here in Australia, you should rightly expect that things will change and how we manage the virus.” Speaking at one of the...