Northern Ireland reported four deaths of people who tested positive for coronavirus today, bringing its total to 82.

But you may notice something odd when you add up all the reported figures from the nations in the UK: they don't add up to the figure given by Foreign Secretary Dominic Raab.

England reported 765 deaths, Scotland 81, and Wales 41. With Northern Ireland, that makes a total of 891, compared to the 881 given by Mr Raab.

The answer is simply that each nation submits its latest total by a set deadline for the UK figures. But sometimes they continue to update their own daily total, giving a different number from the headline UK-wide figure.

It brings the total number of confirmed coronavirus deaths in the UK to 7,978 since the first one was reported on 5 March.

London has suffered the largest number of deaths, followed by the Midlands.

Rajini Vaidyanathan
BBC News

In the early hours of Thursday morning, the first of seven repatriation flights to bring UK citizens home from India landed in London.

More than 300 Britons were on the flight from Goa, including Amanda Ashworth and her three young children. Relieved to finally return home, she said the UK government had made her feel like she was “out on a limb”, and had taken too long to act.

Those who are still stranded share that sentiment. As other countries including Germany and Ireland have laid on rescue flights for thousands of their citizens in India, Brits have looked on with frustration. In the next few days more flights will leave from Goa, Delhi and Mumbai, but there’s concern among British Indians that tourists have been prioritised and they have been ignored.

Tanmanjeet Singh Dhesi, the MP for Slough, told the BBC that the largest number of Brits were in Punjab and Gujarat. “They’re feeling discriminated against,” he said.

Officials say they’re doing all they can to arrange more flights, but given the sheer numbers, it’ll take time. Many of those still waiting say they’re running out of food, money and medicine.

The Scottish football season has been pushed back with all games suspended until at least 10 June.

Games were halted on 13 March because of the coronavirus pandemic and had been originally been stopped until 30 April.

On 31 December 2019 – exactly 100 days ago – the Chinese government reported the detection of a “pneumonia of unknown cause” to the World Health Organization (WHO).

That illness would come to be called Covid-19. First detected in the Chinese city of Wuhan, the disease has since swept across the world, infecting more than 1.5 million people, about 90,000 of whom have died.

The grim 100-day milestone was acknowledged by the head of the WHO, Tedros Adhanom Ghebreyesus, at a media briefing on Thursday.

In a sobering statement, external, Dr Tedros said Covid-19 had “overwhelmed health systems, disrupted the global economy, and lead to widespread social disruption”.

The pandemic, he said, was much worse than a health crisis, requiring “a whole-of government and whole-of-society response”.

“In the last 100 days, Covid-19 has shown us the damage it can mete out in wealthy nations,” Dr Tedros said.

So, what did happen in those 100 days? Here is a timeline of key events so far:

• 31 December 2019: China informs the WHO of "cases of pneumonia of unknown cause” detected in Wuhan
• 11 January: China reports its first known death from an illness caused by Covid-19
• 12 January: China publicly shares the genetic sequence of Covid-19
• 13 January: The first Covid-19 case outside China is reported in Thailand, heralding the start of its spread worldwide
• 23 January: A lockdown is imposed in Wuhan, a city of 11 million people
• 30 January: A “public health emergency of international concern” is officially declared by the WHO
• 7 February: Li Wenliang, a Chinese doctor who tried to warn the world about Covid-19, dies with the disease
• 22 February: Italy reports its first coronavirus deaths, as it introduces social-distancing measures
• 11 March: The WHO labels the coronavirus outbreak a pandemic
• 27 March: UK Prime Minister Boris Johnson tests positive for coronavirus, the first known world leader to do so

Many people on social media posted video of the Clap for Carers event, as people applauded and made some noise in support of NHS staff and other frontline workers in the pandemic.

Here's how it sounded in a few parts of the country.

And the alarm at Harland and Wolff in Belfast - the shipyard that made the Titanic - was sounded for the first time in about 20 years as a sign of appreciation.

Anna Holligan
BBC News reporter cycling in The Hague

With the gyms closed and public transport to be avoided, many of us are running or cycling or simply walking to keep fit, commute or just catch a breath of fresh air. But a group of researchers are warning we should perhaps beware.

While the standard social distancing rule between 1–2 metres may be effective when you are standing still inside, according to a new simulation, people who are in motion should be given a wider berth to avoid passing on the Coronavirus.

In a simulation they found a pedestrian or cyclist sneezes, coughs or even just exhales, the saliva particles are left behind in the air.

Which means the person coming up behind you passes through this cloud of droplets.

By using methods used to enhance athletes performances, the teams from Eindhoven University of Technology and Leuven University found the greatest risk of infection exists in the slipstream.

On the basis of these results - which haven’t yet been published - they advise that those on the move should be given more of a social distance.

Walkers should get at least 4 metres, runners 10 metres and for cyclists at least 20 metres.

Something that’s pretty unrealistic in most cities.

And the teams have jumped the gun a bit, going to press before actually publishing a study, bypassing the normal route.

Jogging during the day has already been banned in Paris, this research may encourage us to think twice before overtaking, to ensure we’re getting a healthy breath of fresh air - rather than one that might include a strangers saliva particles.

Although there is no suggestion that cycling, running or walking is irresponsible during a pandemic. The advice in many places battling the virus is to stay at home as much as possible.

As the UK applauded NHS workers, Boris Johnson's pregnant fiancee, Carrie Symonds, posted several clapping emoji along with an image of a rainbow.

Earlier this evening it was announced that the prime minister had been moved out of intensive care at St Thomas' Hospital in London.

The hashtag YesBoris is trending in the UK alongside #clapforourkeyworkers and #ClapForTheNHS following the news that Boris Johnson has left intensive care.

Also welcoming the news is US President Donald Trump who tweets: "Great News: Prime Minister Boris Johnson has just been moved out of Intensive Care. Get well Boris!!!"

All across the UK applause is ringing out in the third "Clap for Carers" event, as people in lockdown show their appreciation for NHS workers and other staff on the front line of the pandemic.

Shortly before the 20:00 BST start, a plane was seen flying over Liverpool with a banner bearing a message of thanks.

Image source, PA Media

Jessica Parker
BBC political correspondent

I don’t think we’ll hear any more from Downing Street on Boris Johnson's condition. Their approach has been wanting to give updates where they are necessary, not a running commentary on his health.

Clearly it's positive news for the prime minister after that stay in intensive care. His recovery is clearly going to continue over a number of days. Dominic Raab, the foreign secretary and first secretary of state, continues to deputise for the PM.

It’s too soon to speculate how much time this situation will last. It’ll be up to the prime minister's medical team what his recovery period is and when he can start working.

He has not been working since Monday - before his move to intensive care, when he was on a ward. He was given the red box - a ministerial box of government documents - but that changed when his condition worsened on Monday evening.

The expectation is that Raab will continue to deputise for the prime minister. He’s been chairing the meetings. This is positive news but it clearly doesn’t mean Johnson is back in Number 10 now. He’s still recovering.

For the third week running, people across the UK are gearing up to applaud NHS staff and other key workers for their bravery during the pandemic.

The "Clap for Carers" tribute is due to start at 20:00 BST, with people gathering on their doorsteps - at least 2m apart from other households - in gardens or on apartment balconies to make some noise in appreciation.

In previous weeks, buildings have been lit up in NHS blue as people clap, play musical instruments or just bang pots and pans to ensure their gratitude can be heard.

On social media, people were urging others to take part and saying how much it means to NHS workers they know.

The news that UK Prime Minister Boris Johnson is out of intensive care is being widely welcomed across the political spectrum.

"Good news," tweeted Scotland's First Minister Nicola Sturgeon, "brilliant news" said International Trade Secretary Liz Truss and "hooray!" was the reaction from Environment Minister Zac Goldsmith.

Labour's shadow justice secretary David Lammy said: "Pleased Boris Johnson has been moved out of intensive care - the whole country is willing him on to make a full recovery as soon as possible."

Image source, AFP

As many as 36 prisoners in Iran are thought to have been killed after security forces used live ammunition and tear gas to quell protests among inmates who feared they were at risk of contracting Covid-19 in jail, according to Amnesty International, external. The human rights group cited sources as saying lethal force was used in the Sepidar and Sheiban prisons in the city of Ahvaz on 30 and 31 March. There was no immediate comment from officials

In Lebanon, security forces have stopped a man from setting himself on fire outside a bank. The man reportedly had issues with the branch in Marjayoun. Banks have been a target of anger among Lebanese, who hold them partly to blame for the country's current financial crisis, which has been exacerbated by the pandemic

The Gaza Strip ran out of coronavirus test kits on Wednesday, according to the Hamas-run health ministry. Spokesman Ashraf al-Qudra said dozens of samples were awaiting testing. Officials fear Covid-19 could spread fast through the blockaded enclave and that its overstretched hospitals could be overwhelmed

Jonathan Marcus
BBC diplomatic and defence correspondent

Another US aircraft carrier has seen an outbreak of the coronavirus. Although the number of cases on the USS Nimitz is small, it is a worrying signal for the US Navy.

The crew were starting to go on board this month with the idea of remaining there in quarantine ahead of their summer deployment to the Pacific.

Another aircraft carrier - the Theodore Roosevelt - has already had to dock in Guam after a significant outbreak with over 300 of the crew testing positive. The controversy surrounding the captain’s efforts to warn his superiors of the situation cost him his job and subsequently, the job of the acting US Navy secretary who fired him.

As we have already seen on cruise liners, it is impossible to stop the spread of the virus in the confined spaces of a ship, even a massive vessel like the Roosevelt, which, with its air wing, has a crew of over 5,500. The disruption is going to significantly impact the readiness of the US carrier fleet, which even in normal times is under huge operational pressure.

Image source, Getty Images

We have a new update on Boris Johnson's health.

A spokesman for the UK prime minister said: "The prime minister has been moved this evening from intensive care back to the ward, where he will receive close monitoring during the early phase of his recovery."

"He is in extremely good spirits."

It's getting towards that time again. In just under an hour the British public will join in a round of applause for NHS staff, teachers, bus drivers, waste collectors and many other essential workers.

The first nationwide applause - known as Clap For Carers - began a fortnight ago after being kick-started by Dutch-born Londoner Annemarie Plas.

And after "incredible" responses so far, the organisers have said they want to make it a weekly event - every Thursday at 20:00 BST.

Watch the video above for a quick look back at last week's scenes across the country.

David Shukman
Science editor, BBC News

A group of scientists is calling for the public to wear face masks as a way of combatting the spread of the coronavirus.

In the British Medical Journal, they say that despite limited evidence, “we have little to lose and potentially something to gain”.

In one article, Professor Trisha Greenhalgh of the University of Oxford writes that masks“ could have a substantial impact on transmission with a relatively small impact on social and economic life”.

In a related editorial, Professor Babak Javid of Tsinghua University in Beijing says the benefits are "plausible" and the harms "unlikely".

He points to emerging evidence that the virus can be spread by people who are infected but do not yet show symptoms or never show them at all.

Citing this research into what is called “asymptomatic transmission”, the US Centers for Disease Control recommended last week that Americans wear masks outside their homes.

This puts the US government and many others at odds with the advice of the World Health Organisation and the UK health authorities.

The WHO and Public Health England warn that masks may give the public a false sense of security, encouraging people not to observe social distancing or frequent hand-washing, and that they may become infected by failing to handle their masks carefully.

Earlier this week BBC News looked into whether you should wear masks or not

Image source, Defence Imagery

Image source, Defence Imagery

Soldiers have been testing NHS staff at facilities in Glasgow, Manchester and Birmingham.

Some soldiers were trained in carrying out the tests by specialist staff.

The coronavirus pandemic is likely cause the worst recession in almost a century, the head of the International Monetary Fund (IMF) has said.

Kristalina Georgieva said that growth across the world would turn "sharply negative" in 2020 and that most countries - regardless of their income - would face a fall in incomes.

"In fact, we anticipate the worst economic fallout since the Great Depression," she said.

A partial recovery next year is possible, Georgieva explained, but only if the virus began to fade later this year.

Her speech comes ahead of next week's spring meetings for the IMF and World Bank, which will be held online because of the outbreak.