WASHINGTON-The United States on Thursday took the grim title of the country with the most coronavirus infections and reported a record surge in unemployment as world leaders vowed $5 trillion to stave off global economic collapse.

More than 500,000 people around the world have now contracted the new coronavirus, overwhelming healthcare systems even in wealthy nations and triggering an avalanche of government-ordered lockdowns that have disrupted life for billions.

In the United States, more than 83,000 people have tested positive for COVID-19, edging out Italy, which has reported the most deaths, and China, where the virus was first detected in December in the metropolis of Wuhan.

The US has recorded 1,178 deaths, while the global death toll stood at 23,293.

“We are waging war on this virus using every financial, scientific, medical, pharmaceutical and military resource, to halt its spread and protect our citizens,” US President Donald Trump said.

With about 40 percent of Americans under lockdown orders, Trump urged citizens to do their part by practicing social distancing: “Stay home. Just relax, stay home.”

With fears mounting of a global recession if not depression, leaders from the Group of 20 major economies held crisis talks by video link Thursday, pledging a “united front” to fight the outbreak -- along with an enormous financial injection.

“The virus respects no borders,” the leaders said in a statement. “We are injecting over $5 trillion into the global economy, as part of targeted fiscal policy, economic measures, and guarantee schemes to counteract the social, economic and financial impacts of the pandemic.”

They also pledged “robust” support for developing nations, where coronavirus could next take hold after ravaging China and then Europe.

But the unity pledged by the G20 has been in short supply, with China and the United States trading barbs over their handling of the coronavirus crisis.

And Italy as well as Spain, which has the second-highest death toll, objected to a draft economic plan by the European Union which they saw as too weak.

Italian Prime Minister Giuseppe Conte wants a “strong and sufficient” financial response that deploys “innovative financial instruments truly adapted to a war,” his office said.

Record one-day toll in France

Alarmed by the rapid spread of the sickness in Italy, France has taken aggressive action to stem the virus and went under lockdown on March 17.

But the 365 deaths reported Thursday was its highest in a one-day period and, alarmingly, included a 16-year-old girl -- a rare case of a young person succumbing to a virus that has devastated the elderly.

“It is very difficult to estimate when the peak will come,” French health official Jerome Salomon said. “People who are ill now were infected before the confinement began.”

“Now there is less contact, people are going out less and get infected less. So we hope there will be fewer people getting sick next week and fewer people going to hospital,” he told reporters.