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The COVID-19 death toll in the United States has surpassed 350,000 as experts anticipate another surge in coronavirus cases and deaths stemming from holiday gatherings over Christmas and New Year's.

Data compiled by Johns Hopkins University shows the US passed the threshold early Sunday morning (Sunday night AEDT). More than 20 million people in the country have been infected.

The US has begun using two coronavirus vaccines to protect health care workers and nursing home residents and staff but the rollout of the inoculation program has been criticised as being slow and chaotic.

READ MORE: US records deadliest day as cases surge to 20 million

The US by far has reported the most deaths from COVID-19 in the world, followed by Brazil, which has reported more than 195,000 deaths.

As communities across the country feel the pain of the surge in cases, funeral homes in the hot spot of Southern California say they must turn away grieving families as they run out of space for the bodies piling up.

The head of the state funeral directors association says mortuaries are being inundated.

"I've been in the funeral industry for 40 years and never in my life did I think that this could happen, that I'd have to tell a family, 'No, we can't take your family member'," said Magda Maldonado, owner of Continental Funeral Home in Los Angeles.

Continental is averaging about 30 body removals a day — six times its normal rate. Mortuary owners are calling one another to see whether anyone can handle overflow, and the answer is always the same: They're full, too.

READ MORE: How Sydney's Berala cluster erupted

In order to keep up with the flood of bodies, Maldonado has rented extra 15m refrigerators for two of the four facilities she runs in LA and surrounding counties. Continental has also been delaying pickups at hospitals for a day or two while they deal with residential clients.

Bob Achermann, executive director of the California Funeral Directors Association, said that the whole process of burying and cremating bodies has slowed down, including embalming bodies and obtaining death certificates. During normal times, cremation might happen within a day or two; now it takes at least a week or longer.

Achermann said that in the southern part of the state, "every funeral home I talk to says, 'We're paddling as fast as we can'."

"The volume is just incredible and they fear that they won't be able to keep up," he said. "And the worst of the surge could still be ahead of us."

Los Angeles County, the epicentre of the crisis in California, has surpassed 10,000 COVID-19 deaths alone. Hospitals in the area are overwhelmed, and are struggling to keep up with basics such as oxygen as they treat an unprecedented number of patients with respiratory issues. On Saturday, US Army Corps of Engineers crews arrived to update some hospital's oxygen delivery systems.

READ MORE: UK's Johnson warns of more lockdown measures as virus soars

Nationally, an average of just over 2500 people have died of COVID-19 over the past seven days, according to Johns Hopkins data. The number of daily newly reported cases in that period has averaged close to 195,000, a decline from two weeks earlier.

It's feared that holiday gatherings could fuel yet another rise in cases.

Arkansas officials reported a record of more than 4300 new COVID-19 cases Friday. Governor Asa Hutchinson tweeted that the state is "certainly in the surge after Christmas travel and gatherings" and added, "As we enter this new year, our first resolution should be to follow guidelines."

North Carolina officials also reported a record 9527 confirmed cases New Year's Day. That's more than 1000 cases above the previous daily high.

In Louisiana, a funeral was being held Saturday for a congressman-elect who died of COVID-19 complications. Republican Luke Letlow died Tuesday at age 41. His swearing-in had been scheduled Sunday. He leaves behind his wife, Julia Letlow, and two children, ages 1 and 3.

READ MORE: Sydney crowd at Human Nature concert sparks fears

In Texas, state officials say they have only 580 intensive care beds available as staff treat more than 12,480 hospitalised coronavirus patients, a number that has risen steadily since September and has set record highs this past week.

In Window Rock, Arizona, the Navajo Nation remained in the midst of a weekend lockdown to try to slow the rate of infection. The tribe late Friday reported another seven deaths, bringing its totals since the pandemic began to 23,429 cases and 813 deaths. The reservation includes parts of Arizona, New Mexico and Utah.

The number of infections is thought to be far higher than reported because many people have not been tested, and studies suggest people can be infected with the virus without feeling sick.

Arizona on Saturday reported 18,943 new cases Friday and Saturday, a record for the state in any two-day period. It also reported 46 new deaths Saturday.

Genomic sequencing has revealed the Berala cluster is not linked to the Avalon outbreak in Sydney's Northern Beaches.

NSW Chief Health Officer Dr Kerry Chant said a member of a family group who had returned from overseas and been taken to a health facility had passed the virus on to a patient transport worker.

That worker then passed the virus onto a colleague who visited the Berala BWS for a "fleeting amount of time" on December 20.

https://twitter.com/NSWHealth/status/1345521508735541248

That's when the BWS employee became infected. They also passed it onto a co-worker, and between them they worked every day from December 22 to 31.

That has left NSW Health with the mammoth task of contacting thousands of customers who visited the store throughout that Christmas period, a seeding event that has made the Berala cluster emerge as the most worrying in Sydney.

Health officials are using customers' credit and rewards card details to track down close contacts.

Woolworths, which owns BWS, has also provided contact tracers with CCTV from inside the store to determine how the original transmission occurred.

NSW Health has issued alerts for big windows of time at the BWS between Tuesday, December 22 and Thursday, December 31 where transmission may have occurred.

Anyone who attended the store has been asked to get tested immediately and isolate for 14 days regardless of the test result.

READ MORE: Couple accused of escaping quarantine speak out

"We know these transmission events have happened through very minimal exposure, we are asking members of the community who did purchase alcohol or enter that premises for that period to be very vigilant and take the public health action of isolating for 14 days if you were there at those times," Dr Chant said.

"Anyone living in the Berala area has also been asked to come forward for testing if they develop any symptoms associated with COVID-19.

"We are still concerned about a case that occurred yesterday where we still haven't managed to find links in terms of the Avalon cluster."

https://twitter.com/NSWHealth/status/1345548721916764166

Investigations continue into the links between the Wollongong, Croydon and Avalon clusters.

Dr Chant said the BWS store on Woodburn Road in Berala is a transmission site of particular concern to authorities.

"We know that there have been transmission events at this venue. And it is important that we know that also those transmission events occurred through what appear to be very brief exposures at that venue," she said.

More than 2000 people have been contacted and told to get tested and isolate in relation to the BWS store.

"I know it was a busy period, but we are very concerned that transmission has occurred at this site and it is important because the duration of time means that someone who has previously been there could have actually transmitted it to another group of people."

British Prime Minister Boris Johnson warned that more onerous lockdown restrictions in England are likely as the country reels from a new coronavirus variant that has pushed infection rates to their highest recorded levels.

Johnson, though, insisted he has "no doubt" that schools are safe and urged parents to send their children back into the classroom in areas of England where they can. Unions representing teachers have called for schools to turn to remote learning for at least a couple of weeks more due to the new variant, which scientists have said is up to 70 per cent more contagious.

The UK is in the midst of an acute outbreak, recording more than 50,000 new coronavirus infections a day over the past five days. On Saturday, it notched a daily record of 57,725 new cases. The country, with nearly 75,000 virus-related deaths, is alternating with Italy as the worst-hit European nation, according to figures compiled by Johns Hopkins University.

READ MORE: Coronavirus vaccination appointment turns into proposal

"We are entirely reconciled to do what it takes to get the virus under control, that may involve tougher measures in the weeks ahead," Johnson said in an interview with the BBC. "Obviously there are a range of tougher measures that we would have to consider."

Johnson conceded that school closures, curfews and the total banning of household mixing could be on the agenda for areas under the most stress.

London and southeast England are facing extremely high levels of new infections and there is speculation that restrictions there will have to be tightened to bring the virus under control. In some parts of the British capital and its surrounding areas, there are around 1000 cases per 100,000 people.

Johnson's government is using a tiered coronavirus restrictions system. Most of England is already at the highest Tier 4 level, which involves the closure of shops not selling non-essential items and places like gyms and recreation centres as well as a stay-at-home instruction.

"What we are using now is the tiering system, which is a very tough system, and alas probably about to get tougher to keep things under control," he said. "We'll review it and we have the prospect of vaccines coming down the tracks in their tens of millions, offering people literally life and hope."

READ MORE: UK in 'eye of the storm' amid surging new coronavirus cases

The UK has moved quickly on the vaccination front. It was the first to begin vaccinating people over 80 and health care workers on December 8 with the Pfizer-BioNTech coronavirus vaccine. Last week, regulators approved another vaccine made by Oxford University and pharmaceutical giant AstraZeneca that is cheaper and easier to use than the Pfizer vaccine.

Hundreds of new vaccination sites are due to be up and running this week as the National Health Service ramps up its immunisation program with the Oxford-AstraZeneca jab. Officials say around 530,000 doses of the new vaccine will be in place Monday as the country moves towards its goal of vaccinating 2 million people a week as soon as possible.

"We do hope that we will be able to do tens of millions in the course of the next three months," Johnson said.

The Oxford-AstraZeneca shot will be administered at a small number of hospitals for the first few days so authorities can be on the lookout for any adverse reactions. Hundreds of new vaccination sites — at both hospitals as well as local doctor's offices — are due to launch this week, joining the more than 700 already in operation, NHS England said.

READ MORE: Sydney crowd at Human Nature concert sparks concern

In a shift from practices in the US and elsewhere, Britain plans to give people second doses of both vaccines within 12 weeks of the first shot rather than within 21 days, to accelerate immunisations across as many people as quickly as possible.

"My mum, as well as you or your older loved ones, may be affected by this decision, but it is still the right thing to do for the nation as a whole," the government's deputy chief medical officer, Professor Jonathan Van-Tam, said in an article for the Mail on Sunday newspaper.

A bushfire that burned through more than 70 hectares of land and edged dangerously close to homes north of Perth has now left many without water and power.

The Wundowie blaze came within metres of houses and left a truck driver trapped in the middle of it, unable to turn around.

He filmed the fire coming closer to him before firefighters eventually got the blaze under control enough for the truckie to make it through.

Resident Ashlee Martinelli said she saw smoke coming towards her house, and 10 minutes later flames were in the backyard.

She and her parents chose to stay and defend the home, grabbing passports, family photos and animals.

"(It was) so warm and it was just black, you could hardly see and because of the sun it was like a weird orange colour," Ms Martinelli told 9News.

"Mum's horse float the back end caught on fire and the shed nearly caught on."

The fire has since been downgraded to a watch and act, but firefighters are still on alert.

https://twitter.com/dfes_wa/status/1345650613955166208

The town's water pipeline exploded in the fire, and homes could be without power for days.

Fire officials say the blaze was started accidentally and is not the work of an arsonist.