The number of confirmed coronavirus cases worldwide has topped 16 million.
According to a tally by Johns Hopkins University, the US leads the count with 4.1 million, followed by 2.3 million in Brazil and 1.3 million in India.
The US also has the highest number of deaths with 146,460, followed by 86,449 in Brazil and 45,823 in the UK.
In the US, New York state leads with 32,608 deaths.
In South Korea, the number of new cases fell back to below 60, a day after it reported 100-plus for the first time in nearly four months.
The Korea Centres for Disease Control and Prevention confirmed 58 additional cases over the past 24-hour period, taking the total to 14,150 with 298 deaths.
Twelve of the newly confirmed cases were locally infected while the rest came from overseas.
Health authorities said the 113 cases on Saturday were mostly imported infections found among cargo ship crews and hundreds of South Korean construction workers airlifted out of virus-ravaged Iraq.
Authorities in Da Nang banned gatherings of more than 30 people in public places as well as all sport, cultural and religious events in the city of 1.1 million. Theme parks, beauty salons, bars and clubs were also ordered to shut.
On Sunday, a 61-year-old man was confirmed to be infected, a day after a 57-year-old tested positive for the coronavirus. Both are in a critical condition and require life support.
A team of doctors who successfully cured a British pilot of Covid-19 flew to Da Nang to direct the treatment of the two patients.
Health workers, however, have not been able to establish a connection between the two men, nor trace the source of infection. It was reported that they had not travelled out of the city, where there have been no cases since April, for the last month.
Several hundred people who had been in contact with the men have initially tested negative for the virus. The city has also started testing on a larger scale.
The new infections take Vietnam’s cases to 418 with no deaths.
China reported 46 new Covid-19 cases on Sunday, the highest daily tally in more than a month, as it took steps to stem recent outbreaks that have infected more than 160 people at opposite ends of the country.
Authorities confirmed 22 cases in Urumqi, a city in the Xinjiang region in the country’s far west, the official Xinhua News Agency said. That took the total in the local outbreak to 137 since the first case was detected 10 days ago.
Another 13 cases were confirmed in Liaoning province in the north-east, taking the total there to 25, almost all in the city of Dalian.
The National Health Commission also reported 11 imported cases in the latest 24-hour period, in people who had arrived from overseas.
In Australia, Victoria state recorded 10 deaths overnight – its highest daily toll amid a continuing surge in cases.
State Premier Daniel Andrews said the deaths included seven men and three women. A man in his 40s became one of the youngest Covid-19 fatalities in Australia.
There were 459 new infections, the 21st straight day of triple-figure increases.
The deaths take Victoria’s toll to 71 and Australia’s national tally to 155. A total of 228 people are in hospital in Victoria, 42 of them in intensive care.
Victoria processed 42,973 tests on Saturday, Mr Andrews said, “far and away the biggest testing result that we’ve seen on a single day”.
He said he is not currently planning to extend the lockdown in Melbourne, Australia’s second-largest city.