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The bird flu virus isolated from a girl who died from the disease had mutations that made it better adapted to human cells, Sky News has learned.

The 11-year-old is believed to have been infected by poultry kept by her family in Prey Veng province, in the south of Cambodia.

Her father also tested positive for the H5N1 virus, but did not develop symptoms.

Dr Erik Karlsson, who led the team at the Pasteur Institute of Cambodia that decoded the genetic sequence of the girl’s virus, said it differed from samples taken from birds.

“There are some indications that this virus has gone through a human,” he revealed in an exclusive interview.

“Any time these viruses get into a new host they’ll have certain changes that allow them to replicate a little bit better or potentially bind to the cells in our respiratory tract a little bit better.”

Dr Erik Karlsson, who led the team at the Pasteur Institute of Cambodia that decoded the genetic sequence of the girl's virus
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Dr Erik Karlsson says ‘spillovers’ of the virus is a ‘concern’

He said the mutations were unlikely to have occurred in the girl, but probably existed in a “cloud” of viruses with random genetic changes inside birds.

“Just getting into a new host allows those one or two viruses in that cloud to survive better and become the dominant population,” he said.

But Dr Karlsson added that the virus had yet to fully adapt to humans. “It’s still a bird virus,” he said.

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The virus’s genetic material was sequenced in just 24 hours using technology developed by UK company Oxford Nanopore.

It showed the virus was the 2.3.2.1c variant of H5N1, which is endemic in wild birds and poultry in Cambodia, and not the 2.3.4.4b strain that has spread rapidly around the world and begun to infect some mammals.

But Dr Karlsson said it would be wrong to downplay the threat from the variant in Cambodia.

In this photo released by the Cambodia Ministry of Health, Cambodia health experts work during spray disinfectant at a village in Prey Veng eastern province Cambodia, Friday, Feb. 24, 2023. The father of an 11-year old girl in Cambodia who died this week after contracting bird flu has tested positive for the virus, but has not displayed any major symptoms, health authorities said Friday. (Cambodia Ministry of Health via AP)
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An 11-year-old was infected in Prey Veng, in the south of Cambodia. Pic: AP

“This was a zoonotic spillover [of a virus infecting a new species] and needs to be treated with the utmost concern,” he warned.

According to the World Health Organization (WHO), there have been 873 human cases of H5N1 with 458 deaths.

But so far there is no evidence that the virus spreads easily between people.

A key reason is that bird flu viruses latch on to receptors found only in cells deep in human lungs.

Widespread transmission would require a mutation that allows it to bind to a receptor found on cells in our nasal passages, as human flu viruses do.

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The cells are more vulnerable to infection by an airborne virus, but also release a cloud of infectious material with every breath.

But Dr Karlsson said the world must carefully monitor changes in the virus.

“Something may be happening here in Cambodia and something may be happening on the other side of the world in South America, but we don’t really know what could cause the problem tomorrow,” he said.

“It’s critical we all work together to respond to all of those at once. We would love to be off the hook for zoonotic disease, but it will remain a major problem.”

The UK Health Security Agency reported a human case of bird flu in January 2022, though the individual did not develop symptoms.

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Bird flu becoming an endemic

So far this winter there have been more than 3,100 exposures to the H5N1 virus in people working closely with sick birds. None of them tested positive.

Health officials are also analysing a small number of samples taken from patients with flu symptoms to check the bird virus is not spreading below the radar.

Dr Karlsson said: “It’s concerning that it’s gone global so quickly.

“In Europe, as well as North America and South America, there have been massive poultry infections and spillovers to mammals.

“Each one of those spillovers is a concern.”

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US envoy meets Putin for talks – as Trump urges Russia to ‘get moving’ on Ukraine

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US envoy meets Putin for talks - as Trump urges Russia to 'get moving' on Ukraine

Donald Trump’s special envoy Steve Witkoff has met Vladimir Putin for talks in Russia – as the US president called on Moscow to “get moving” with ending the war in Ukraine.

Mr Witkoff, who has been pressing the Kremlin to accept a truce, visited Mr Putin in St Petersburg after earlier meeting the Russian leader’s international co-operation envoy Kirill Dmitriev.

Mr Putin was shown on state TV greeting Mr Witkoff at the city’s presidential library at the start of the latest discussions about the search for a peace deal on Ukraine.

Before Friday’s meeting, Kremlin spokesman Dmitry Peskov played down expectations of a breakthrough and told state media the visit would not be “momentous”.

Follow the latest updates on the war in Ukraine

However, Sky News Moscow correspondent Ivor Bennett said he believes the meeting – Mr Witkoff’s third with Mr Putin this year – is significant as a sign of the Trump administration’s “increasing frustration at the lack of progress on peace talks”.

Earlier on Friday, Mr Trump issued his latest social media statement on trying to end the war, writing on Truth Social: “Russia has to get moving. Too many people ere [sic] DYING, thousands a week, in a terrible and senseless war – A war that should have never happened, and wouldn’t have happened, if I were President!!!”

Dialogue between the US and Russia, aimed at agreeing a ceasefire ahead of a possible peace deal to end the war, has recently appeared to have stalled over disagreements around conditions for a full pause.

President Donald Trump speaks at a cabinet meeting in the Cabinet Room of the White House, Thursday, April 10, 2025, in Washington. (Pool via AP)
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Mr Trump, pictured at a cabinet meeting at the White House earlier this week, has called for Russia to ‘get moving’. Pic: AP

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Secondary sanctions could be imposed on countries that buy Russian oil, Mr Trump has said, if he feels Moscow is dragging its feet on a deal.

Mr Putin has said he is ready in principle to agree a full ceasefire, but argues crucial conditions have yet to be agreed – and that what he calls the root causes of the war have yet to be addressed.

The Russian president wants to dismantle Ukraine as an independent, functioning state and has demanded Kyiv recognise Moscow’s annexation of Crimea and other partly occupied areas, and pull its forces out, as well as a pledge for Ukraine to never join NATO and for the size of its army to be limited.

Zelenskyy renews support calls after attack on home city

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Children killed in strike on Zelenskyy’s home town

Meanwhile, Ukrainian president Volodymyr Zelenskyy has renewed his appeals for more Patriot air defence systems after the deaths of 20 people, including nine children, who were killed when a Russian missile hit apartment buildings and a playground in his home city of Kryvyi Rih last week.

Speaking online at a meeting of the so-called Ramstein group of about 50 nations that provide military support to Ukraine, named after a previous meeting at America’s Ramstein air base in Germany in 2022, Mr Zelenskyy said recent Russian attacks showed Moscow was not ready to accept and implement any realistic and effective peace proposals.

Mr Zelenskyy also made his evening address to the nation, saying: “Ukraine is not just asking – we are ready to buy appropriate additional systems.”

The UK’s defence secretary, John Healy, has said this is “the critical year” for Ukraine – and has confirmed £450m in funding for a military support package.

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Tech executive and his family die after sightseeing helicopter crashes in New York

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Tech executive and his family die after sightseeing helicopter crashes in New York

A family of five Spanish tourists, including three children, have been killed in a helicopter crash in New York City.

A New York City Hall spokesman identified two of those killed as Agustin Escobar, a Siemens executive, and Merce Camprubi Montal – believed to be his wife, NBC News reported.

The pilot was also killed as the aircraft crashed into the Hudson River at around 3.17pm on Thursday.

New York Police commissioner Jessica Tisch said divers had recovered all those on board from the helicopter, which was upside down in the water.

“Four victims were pronounced dead on scene and two more were removed to local area hospitals, where sadly both succumbed to their injuries,” she said.

The helicopter ended up submerged and upside down. Pic: Reuters
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The helicopter was submerged upside down in the Hudson. Pic: Reuters

A crane lifted out the wreck of the helicopter on Thursday evening. Pic: AP
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A crane lifted out the wreckage on Thursday evening. Pic: AP

The Spanish president Pedro Sanchez called the news “devastating”.

“An unimaginable tragedy. I share the grief of the victims’ loved ones at this heartbreaking time,” he wrote on X.

Rotor blade ‘flew off’

The aircraft was on a tourist flight of Manhattan, run by the New York Helicopters company.

Witnesses described seeing the main rotor blade flying off moments before it dropped out the sky.

Agustin Escobar and Merce Camprubi Montal.
Pic: Facebook
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Agustin Escobar and Merce Camprubi Montal.
Pic: Facebook

Lesly Camacho, a worker at a restaurant along the river in Hoboken, said she saw the helicopter spinning uncontrollably before it slammed into the water.

“There was a bunch of smoke coming out. It was spinning pretty fast, and it landed in the water really hard,” she said.

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Witness saw ‘parts flying off’ helicopter

Another witness said “the chopper blade flew off”.

“I don’t know what happened to the tail, but it just straight up dropped,” Avi Rakesh told Sky’s US partner, NBC News.

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Video on social media showed parts of the Bell 206 helicopter tumbling through the air and landing in the river.

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New York mayor confirms six dead

First responders walk along Pier 40, Thursday, April 10, 2025, in New York, across from where a helicopter went down in the Hudson River in Jersey City, N.J. (AP Photo/Jennifer Peltz)
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The crash happened near Pier 40. Pic: AP

New York Mayor Eric Adams confirmed the six deaths and said authorities believed the tourists were from Spain.

He said the flight had taken off from a downtown heliport at around 3pm.

Debris floats in the water at the scene where the helicopter crashed into the Hudson River.
Pic: AP
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Pic: Cover Images/AP

The crash happened close to Pier 40 and the Holland tunnel, which links lower Manhattan’s Tribeca neighbourhood with Jersey City to its west.

Tracking service Flight Radar 24 published what it said was the helicopter’s route, with the aircraft appearing to be in the sky for 15 minutes before the crash.

The Federal Aviation Administration and the National Transportation Safety Board have started an investigation.

Agustin Escobar.
Pic:Europa Press/AP
Image:
Agustin Escobar.
Pic: Europa Press/AP

Thursday’s incident comes less than three month after 67 people died when an army helicopter and American Airlines jet collided over the Potomac River in Washington DC.

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Ksenia Karelina: Ballerina arrives home in US after ‘nightmare’ of Russian penal colony

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Ksenia Karelina: Ballerina arrives home in US after 'nightmare' of Russian penal colony

A former ballerina who spent more than a year in a Russian jail for donating £40 to a charity supporting Ukraine has returned home to the US after being freed in a prisoner exchange.

Ksenia Karelina landed at Joint Base Andrews in Maryland at around 11pm, local time, on Thursday.

A smiling Ms Karelina was greeted on the runway by her fiance, the professional boxer Chris van Heerden, and given flowers by Morgan Ortagus, President Donald Trump’s deputy special envoy to the Middle East.

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Ksenia Karelina arrives Thursday, April 10, 2025, at Joint Base Andrews, Md. (AP Photo/Alex Brandon)
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Ksenia Karelina arrives at Joint Base Andrews. Pic: AP

Van Heerden said in a statement he was “overjoyed to hear that the love of my life, Ksenia Karelina, is on her way home from wrongful detention in Russia.

“She has endured a nightmare for 15 months and I cannot wait to hold her. Our dog, Boots, is also eagerly awaiting her return.”

He thanked Mr Trump and his envoys, as well as prominent public figures who had championed her case, including Dana White, a friend of Mr Trump and CEO of the Ultimate Fighting Championship (UFC).

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Ms Karelina, 34, a US-Russian citizen also identified as Ksenia Khavana, was accused of treason when she was arrested in Yekaterinburg, in southwestern Russia, while visiting family in February last year.

Investigators searched her mobile phone and found she made a $51.80 (£40) donation to Razom, a charity that provides aid to Ukraine, on the first day of Russia’s invasion in 2022.

She admitted the charge at a closed trial in the city in August last year and was later jailed for 12 years, to be served in a penal colony.

At a cabinet meeting on Thursday, Mr Trump, who wants to normalise relations with Moscow, said the Kremlin “released the young ballerina and she is now out, and that was good. So we appreciate that”.

Ksenia Karelina is hugged by her boyfriend Chris van Heerden.
Pic: Reuters
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Ksenia Karelina is hugged by her boyfriend, Chris van Heerden. Pic: Reuters

He said the release followed conversations with Russian President Vladimir Putin.

Russian security services accused her of “proactively” collecting money for a Ukrainian organisation that was supplying gear to Kyiv’s forces.

The First Department, a Russian rights group, said the charges stemmed from a $51.80 donation to a US charity aiding Ukraine.

Washington, which had called her case “absolutely ludicrous”, released Arthur Petrov, who it was holding on charges of smuggling sensitive microelectronics to Russia, in the prisoner swap in Abu Dhabi.

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Karelina was among a growing number of Americans arrested in Russia in recent years as tensions between Moscow and Washington spiked over the war in Ukraine.

Her release is the latest in a series of high-profile prisoner exchanges Russia and the US carried out in the last three years – and the second since Mr Trump took office.

White House national security adviser Mike Waltz said members of the Trump administration “continue to work around the clock to ensure Americans detained abroad are returned home to their families”.

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