Britain is just one of five countries to hit the grim milestone of 100,000 coronavirus deaths and it has one of the worst mortality rates in the world.

The Government's official toll is just below that figure, but new data show the toll is more than 108,000 when all death certificates mentioning Covid-19 are included.

The UK's toll is the highest in Europe and, globally, is behind only the US, Brazil, India and Mexico, which have far higher populations.

They are followed by Italy, France, Russia, Iran and Spain.

It should be noted that each country uses its own method to calculate Covid-19 deaths and cases, so comparing and compiling data can be difficult.

Worldwide, there have now been more than 2.1 million deaths and 100 million confirmed cases of the virus as countries race to vaccinate their most vulnerable residents and healthcare workers during devastating second waves.

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Gravediggers bury a COVID-19 victim while surrounded by relatives at the Nossa Senhora Aparecida cemetery in Manaus, Amazonas state, Brazil
Gravediggers bury a Covid-19 victim while surrounded by relatives in Manaus, Brazil

For the 20 countries most affected by Covid-19 worldwide, the UK has the worst mortality rate, with 148.48 deaths per 100,000 people, according to researchers at Johns Hopkins University in the US.

Overall, Britain's rate is fourth in the world behind tiny San Marino (192.39), Belgium (182.23) and Slovenia (163.44), but ahead of the four countries which have higher death tolls and much higher population totals.

The UK's deadliest day of the pandemic so far was January 20, when the Government announced 1,820 deaths which had occurred within 28 days of a positive test.

Here is a look at the situation in the countries with the five highest death tolls.

1. United States

Medical staff members Shudylyn McHargh and Tanna Ingraham treat a patient in the COVID-19 intensive care unit (ICU) on New Year's Eve at the United Memorial Medical Centerin Houston
Medics wearing PPE treat a coronavirus patient at a hospital in Houston, Texas

Estimated population (according to United Nations Population Division): 331 million

Official Covid-19 deaths (Government-released data): 420,972

Mortality rate (via Johns Hopkins University): 128.67

Now former president Donald Trump, who was hospitalised for Covid-19, oversaw the world's worst outbreak and was widely condemned for his handling of the crisis, which included downplaying the severity of the virus.

Joe Biden was sworn in last week as America's 46th president and he has already proposed a massive financial aid package and imposed tougher measures to curb the spread of the disease and save lives.

But he said the death toll could still top 660,000 "before we begin to turn the corner in a major way".

The US could set a new monthly record for deaths when January ends.

More than 25 million people in the US have tested positive for the virus so far.

The US has increased its vaccine purchases and is in a race to inoculate an average of 1.5 million Americans a day - or 150 million jabs in 100 days.

Biden has asked Congress for more than $400 billion (£291 billion) to fund the vaccination campaign.

2. Brazil

Workers of the SOS Funeral, wearing protective clothing, prepare to remove the body of Adamor Mendonca, 75, who according to relatives had died from the coronavirus disease
Family members weep as a coronavirus victim is removed from a home in Manaus

Estimated population: 212.5 million

Official Covid-19 deaths: 217,664

Mortality rate: 103.91

Brazil's far-right President Jair Bolsonaro has previously dismissed the risks of coronavirus, even comparing it to a "little flu" and opposing lockdown measures in a bid to keep the country's economy moving.

Just a week later he declared that Brazil had "almost reached the end" of the pandemic.

But since then, when Brazil had reported 3,000 fatalities, the number of deaths and cases have soared.

In May last year, South America was declared a new epicentre of the virus and Brazil has continued to hit grim milestones.

Bolsonaro himself tested positive for the disease in July last year. Like Trump, he has been slammed for his poor handling of the situation.

In recent weeks, a shortage of oxygen has worsened the crisis, described as a "medieval plague", with patients suffocating in their hospital beds without oxygen. Soldiers have been brought in to move seriously ill patients around the country.

It is one of a handful of countries where a new and more infectious variant has been detected.

3. India

A medical worker inoculates a doctor with a Covid-19 coronavirus vaccine at the Institute of Kidney Diseases and Research Centre (IKDRC) in Ahmedabad
India plans to vaccinate 300 million people by early August

Estimated population: 1.3 billion

Official Covid-19 deaths: 153,587

Mortality rate: 11.35

India, the world's second most populated country behind China, saw another positive sign on Tuesday as it saw its lowest daily increase in cases (9,102) for nearly seven months.

It has recorded more than 10.6 million cases, the second highest in the world after the United States.

New surveillance suggests more than 50 per cent of Delhi's residents have antibodies against Covid, meaning the capital is closer to achieving herd immunity, said experts.

India, which produces 60 per cent of the world's vaccines, is trying to meet demand within its own borders. The Government plans to vaccinate 300 million people by early August.

It is expected to double health spending in the next fiscal year - to almost £13 billion - to repair its health system after the pandemic.

The strain of India's underfunded healthcare system was put in stark relief during the pandemic, with states forced to set-up makeshift Covid care centres and many hospitals struggling to meet the demand for beds and oxygen cylinders.

4. Mexico

Aerial view showing graves in a new area of El Palmar cemetery reserved for COVID-19 victims in Acapulco
An aerial view showing graves in a cemetery for Covid-19 victims in Acapulco

Estimated population: 128 million

Official Covid-19 deaths: 150,273

Mortality rate: 119.08

Mexico's official death toll passed 150,000 on Monday following a surge in infections in recent weeks that has stretched the health system in the capital to the limit and led to President Andres Manuel Lopez Obrador contracting Covid-19.

It has struggled to contain the pandemic. In the capital, Mexico City, families are struggling to buy or rent vital tanks of oxygen for relatives suffering from the virus.

The president's announcement he had Covid-19 just a few hours after taking a commercial flight unleashed renewed criticism of his handling of the pandemic.

The news capped the deadliest week of the coronavirus pandemic in the country and left questions unanswered about how many people had been close to the president during his three-day visit to parts of northern and central Mexico.

On Monday, a senior World Health Organisation official said the high rate of positive Covid-19 tests in Mexico likely meant the country has been screening too few people.

5. United Kingdom

Clinical staff wear Personal Protective Equipment (PPE) as they care for a patient at the Intensive Care unit at Royal Papworth Hospital
Staff wear PPE in the ICU at Royal Papworth Hospital in Cambridge
Cumulative Covid-19 deaths in the UK
The UK's toll is more than 108,000 when all death certificates mentioning Covid-19 are included

Estimated population: 68 million

Official Covid-19 deaths: 98,723

Mortality rate: 148.48

From failing to ban arrivals from China in the early days to delaying lockdowns, Prime Minister Boris Johnson, who was hospitalised with the disease last year, has been heavily criticised for his Government's response to the Covid-19 crisis.

The devastating second wave has been fuelled by a new, more infectious mutant strain - the UK variant - which has now spread to other countries.

And there is uncertainty over whether the Government will meet its mid-February target of offering a first dose of a vaccine to 15 million people in the highest priority groups.

The Government's decision to delay giving a second dose by up to 12 weeks - instead of three - has been questioned by medics.

It is only just now going to force passengers arriving in England from high-risk hotspots to quarantine in hotels to ensure they self-isolate.

It comes 10 months after Australia became the first country to do so.