Coronavirus Australia live update: NSW records new local Covid case in Sydney; India travel ban challenged in federal court

Man in his 50s tests positive for Covid in NSW; hearing to take place in federal court to challenge India travel ban. Follow latest updates

7.12am BST

I was delighted to welcome @MarisePayne and Minister @JY_LeDrian to Australia House yesterday at the start of @G7 talks.

6.59am BST

Professor of global security at UNSW, Raina MacIntyre, has used mathematical modelling to determine the effectiveness of a range of Covid-19 vaccine strategies.

Published in the medical journal Vaccine, it says because vaccine supply is limited, the government has adopted a targeted approach, vaccinating the most high-risk and vulnerable first, to make the most of the limited supply.

A limited supply requires a targeted strategy where particular populations are prioritised.

We show that for a population of 7.5 million people [ie, NSW], if faced with an epidemic and an initial restriction in vaccine supply, sustained epidemic control cannot be achieved by this smaller, targeted vaccination strategy.

While our model shows that a targeted vaccine strategy can still reduce illness and death from Covid-19 – it is clear that a mass vaccination strategy would be far more effective at controlling disease.

Encouragingly, our model suggests that herd immunity can be achieved in states like NSW by vaccinating two thirds of the population with a high efficacy vaccine.

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