WASHINGTON (AFP) - New United States President Joe Biden warned the worst of the pandemic is still to come, as the number of American coronavirus deaths surpassed the country's troop fatalities in World War II.
Coronavirus cases have surged pasted 96 million worldwide, fuelled by the emergence of new variants including one that was first detected in Britain and has now spread to more than 60 nations, the World Health Organisation said on Wednesday (Jan 20).
The US remains the worst-hit country, with around a fifth of the two million global Covid-19 deaths, and Mr Biden has made the fight against the pandemic his administration's top priority.
"We need all our strength to persevere through this dark winter. We're entering what may be the toughest and deadliest period of the virus," he said at his inauguration, where those in attendance wore face masks and social distancing was enforced.
A Johns Hopkins University tracker on Wednesday showed that 405,400 people have died from the disease, more than the 405,399 total US combat and non-combat deaths in WWII.
Among the Biden administration's targets is to inoculate 100 million Americans in 100 days, hoping to revive a vaccine roll-out that had floundered in the last weeks of the Trump presidency.
E-commerce titan Amazon on Wednesday offered its vast logistics infrastructure to help with that effort.
Mr Biden's point-man for fighting the pandemic, Mr Jeff Zients, said the US would also rejoin the WHO, reversing his predecessor's decision.
He added that top US expert Anthony Fauci would lead a delegation to the WHO executive board meeting on Thursday.
The announcement came as the WHO confirmed that the virus variant first detected in Britain had spread to more than 60 countries, while one that emerged in South Africa has made it to 23.
The South African variant is more contagious than earlier ones, experts have warned.
Both have tempered optimism that mass vaccination will help to end the unpopular restrictions such as shutdowns that have wrecked economies around the world.
There was some good news, however, with early results from two studies on the Pfizer-BioNTech vaccine showing it is effective against the British variant, which is fuelling a surge that has overwhelmed British hospitals.
There are concerns, however, that rich nations are hogging doses - of the 50 nations that have started vaccination campaigns, 40 are high-income, according to WHO assistant director-general Mariangela Simao.
But Ms Simao said efforts were underway to ensure access for all.
"No one needs to panic, because you're going to get a vaccine," she said.
The WHO co-led Covax facility, a globally pooled vaccine procurement and distribution effort, has struck agreements with five manufacturers for two billion vaccine doses.