British authorities warned against large gatherings ahead of the Euro 2020 football final Sunday, fearful of the highly transmissible Delta coronavirus variant that has fuelled outbreaks across the world.

Many nations have been forced to reimpose curbs as they battle outbreaks accelerated by the variant -- which was first detected in India -- while also trying to ramp up vaccinations to allow their economies to reopen.

London on Sunday hosted more than 60,000 fans at Wembley Stadium for the final of the virus-delayed Euro 2020 championship, the biggest crowd at a British football stadium since the start of the pandemic, as England take on Italy.

Authorities are particularly concerned about the risk of large gatherings at fan zones and pubs across England to watch the country's first appearance in a major football final in more than half a century.

"London still remains in a public health crisis," Metropolitan Police Deputy Assistant Commissioner Laurence Taylor said on Saturday, urging people to remain socially distanced.

British Prime Minister Boris Johnson has signalled he intends to ease all remaining restrictions in England on July 19, but infection rates are once again surging across Britain -- driven by the Delta variant.

His government has argued that, with more than 85 per cent of adults having received at least one shot, the link between infections, hospitalisations and deaths has been severed.

But many scientists are deeply uneasy with relaxing all remaining rules, including social distancing and the legal requirement to wear masks on public transport and in indoor spaces.

As England's players departed their St George's Park base on Saturday, a large contingent of cheering fans lined the road, hardly any of them seen wearing masks in video and photos tweeted by the team.

Health experts have expressed concerns about Euro 2020 events becoming super-spreaders throughout the tournament, especially in Britain and Russia because of the Delta variant.

"It is possible, probable even, that regions very little affected in the UK will find themselves infected by supporters returning from London,” Antoine Flahault told AFP ahead of the final.

Authorities in Denmark, Finland and Scotland have already reported infections among fans after they attended Euro matches.

‘Worse, much worse’ 

The known Covid-19 global death toll has topped four million, with the fight complicated by the emergence of variants that have accelerated outbreaks even in countries that had successfully weathered the early phases of the pandemic.

Australia, where restrictions have been reimposed in a number of cities recently, on Sunday announced its first virus-related death in the Sydney outbreak.

It came as authorities warned that the situation in Sydney was expected to worsen, with Australia’s biggest city in its third week of lockdown and its population overwhelmingly unvaccinated.

"Tomorrow and the few days afterwards will be worse, much worse than we’ve seen today,” said Gladys Berejiklian, premier of New South Wales state, of which Sydney is the capital.

South Korea, once held up as a model for Covid-19 response, was set to tighten restrictions from Monday in and around the capital Seoul after new daily infections hit their highest level since the start of the pandemic.

The Asia-Pacific region has seen a dramatic rise in cases in a number of countries, with Thailand, Indonesia, Pakistan and Vietnam imposing fresh restrictions as a result.

Economic impact 

The rapid spread of the Delta variant across Asia, Africa and Latin America is exposing crucial vaccine supply shortages for some of the world’s poorest and most vulnerable populations.

It is also a major hurdle for economies hoping to get back on track after being hammered by the pandemic.

"We are very concerned about the Delta variant and other variants that could emerge and threaten recovery,” US Treasury Secretary Janet Yellen said Sunday, after a G-20 meeting in Venice, Italy.

"We are a connected global economy, what happens in any part of the world affects all other countries.”

The less privileged parts of the world are expected to suffer that economic blow the most.

That impact was in focus in the indigenous town of San Martin Jilotepeque in Guatemala, where shops were closed and streets deserted as some 90,000 residents were confined from Thursday to Sunday to curb the spread of the virus.

For the people of the town, the brief restrictions did not come without a cost.

"We have payments to make, rent and children to support,” said resident Bartolome Chocoj.

"If we are not going to die of Covid, we are going to die of hunger.”