Australia's New South Wales (NSW) state reported zero Covid-19 cases for a fourth straight day on Monday, but concerns about new infections remained as the missing link in a case that has reinstated restrictions continued to elude officials.
Australia's most populous state on Sunday extended social distancing curbs in Sydney by a week after authorities could not find a transmission path between an infected overseas traveller and a resident in his 50s who tested positive last week.
"There has been a lot of work to identify how the transmission event occurred. Unfortunately, we haven't found that missing link," NSW state Chief Health Officer Kerry Chant told reporters in Sydney.
Chant said the man may have contracted the virus through brief contact with a currently unidentified person who was infectious.
"So, because of that, we are still concerned that there may be chains of transmission in the community that are yet unrecognised," she said.
More than 5.3 million people living in and around Sydney, Australia's biggest metropolitan area, have been ordered to wear masks on public transport and at indoor venues, while house gatherings are limited to 20 guests until May 17.
NSW on Monday opened a mass vaccination hub in Sydney aiming to administer up to 30,000 vaccines every week to ramp up a national vaccination programme that is behind schedule.
With just over 29,900 Covid-19 cases and 910 deaths, Australia has fared much better than many other developed countries but its countrywide immunisation drive has hit roadblocks.
The federal government was developing a plan to open Australia's borders in stages and would consider options to make it easier for vaccinated people to leave the country and return, Health Minister Greg Hunt said.
Australia closed its international border to all but citizens and permanent residents in March 2020. Overseas travellers, except from New Zealand, must undergo two weeks of hotel quarantine at their own expense.
A Federal Court judge on Monday dismissed an application to overthrow the government's ban on travellers from India, including Australian citizens, imposed due to the surge in Covid-19 cases there, a court spokesman said. The ban is due to be lifted on May 15.
More than 35,000 Australians abroad have registered with the foreign ministry to return home but the country allows only about 5,800 people to enter each week.
More than 2.65 million vaccine doses had been administered as of Saturday, far short of the 4 million pledged by the end of March.
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