Coronavirus briefs
Australia’s states closed their borders as new clusters of the Delta variant emerged across the country. Around 80% of Australians are now living under restrictions and their “travel bubble” with New Zealand has been suspended. Just 5% of the population has been vaccinated. Mixing different covid-19 vaccines could boost immunity against the coronavirus, according to researchers at Oxford University. A shot of Pfizer-BioNTech’s vaccine four weeks after one of Oxford-AstraZeneca’s, and vice versa, produced a high level of antibodies. Kim Jong Un, North Korea’s dictator, dismissed senior officials for “incompetence and irresponsibility” related to pandemic prevention. Mr Kim did not admit that there had been a covid-19 outbreak in his country. Last week North Korea again told the World Health Organisation that it had recorded no cases. → For our latest coverage of…