A case of the flesh-eating screwworm parasite has been detected in a person in the United States for the first time.
The parasitic flies eat cattle and other warm-blooded animals alive, with an outbreak beginning in Central America and southern Mexico late last year.
It is ultimately fatal if left untreated.
The case in the US was identified in a person from Maryland who had travelled from Guatemala.
Beth Thompson, South Dakota’s state veterinarian, told Reuters on Sunday that she was notified of the case within the last week.
A Maryland state government official also confirmed the case.
The person was treated and prevention measures were implemented, Reuters reports.
The Centres for Disease Control and Prevention (CDC) and the Maryland Department of Health did not immediately respond to requests for comment.
What is screwworm?
The female screwworm fly lays eggs in the wounds of warm-blooded animals and once hatched, hundreds of screwworm larvae use their sharp mouths to burrow through living flesh.
It can be devastating in cattle and wildlife, and has also been known to infect humans.
Treatment is onerous, and involves removing hundreds of larvae and thoroughly disinfecting wounds. They are largely survivable if treated early enough.
The confirmed case is likely to rattle the beef and cattle futures market, which has seen record-high prices because of tight supplies.
The US typically imports more than a million cattle from Mexico each year to process into beef. The screwworm outbreak could cost Texas – the biggest cattle-producing state – $1.8bn (£1.3bn) in livestock deaths, labour costs and medication expenses.
Image: A view shows a calf after being sprayed with a disinfectant spray to prevent screwworm. Pic: Reuters
The United States Department of Agriculture (USDA) has set traps and sent mounted officers along the border, but it has faced criticism from some cattle producers and market analysts for not acting faster to pursue increased fly production via a sterile fly facility.
What is a sterile fly facility?
The case also comes just one week after the US agriculture secretary, Brooke Rollins, travelled to Texas to announce plans to build a sterile fly facility there in a bid to combat the pest. Ms Rollins had pledged repeatedly to keep screwworm out of the country.
A sterile fly facility produces a large number of male flies and sterilises them – these males are then released to mate with wild female insects, which collapses the wild population over time. This method eradicated screwworm from the US in the 1960s.
Mexico has also taken efforts to limit the spread of the pest, which can kill livestock within weeks if not treated. It had started to build a $51m sterile fly production facility.
The USDA has previously said 500 million flies would need to be released weekly to push the fly back to the Darien Gap, the stretch of rainforest between Panama and Colombia.
The troops are authorised to use their weapons for self-protection.
A White House official told NBC News that despite being armed, as of Saturday night, the National Guard troops in DC are not making arrests, and will continue to work on protecting federal assets.
The troops were largely deployed from outside the state and were framed by President Trump as a concerted effort to tackle crime and homelessness in the nation’s capital.
Such deployments are not common, and are typically used in response natural disasters or civil unrest.
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Democrats have bashed the deployment as partisan in nature, accusing Mr Trump of trying to exert his presidential authority through scare tactics and said his primary targets have been cities with black leadership.
Image: Armed members of the South Carolina National Guard patrol outside of Union Station. Pic: AP
Pentagon plans to deploy US army to Chicago
Yesterday it was reported that the Pentagon was drafting plans to deploy the US army in Chicago, the largest city in the state.
The governor of Illinois then accused Mr Trump of “attempting to manufacture a crisis” and “abusing his power to distract from the pain he is causing working families”.
Officials familiar with the proposals told the Washington Post that several options were being weighed up by the US defence department, including mobilising thousands of National Guard troops in Chicago as early as September.
Mr Trump had told reporters on Friday that “Chicago is a mess”, before attacking the city’s mayor, Brandon Johnson, and hinting “we’ll straighten that one out probably next”.
The governor of Illinois has accused Donald Trump of “attempting to manufacture a crisis” over reports the US president was considering deploying the military in the state.
US newspaper The Washington Post reported on Saturday that the Pentagon was drafting plans to deploy the US army in Chicago, the state capital.
It comes as part of Mr Trump’s crackdown on crime, homelessness, and illegal immigration in mainly Democrat-run cities. He recently deployed the National Guard in Washington DC.
In a statement responding to the report, governor JB Pritzker said Illinoishad “received no requests or outreach from the federal government asking if we need assistance, and we have made no requests for federal intervention”.
He added: “The safety of the people of Illinois is always my top priority.
“There is no emergency that warrants the President of the United States federalising the Illinois National Guard, deploying the National Guard from other states, or sending active duty military within our own borders.”
The governor then said: “Donald Trump is attempting to manufacture a crisis, politicise Americans who serve in uniform, and continue abusing his power to distract from the pain he is causing working families.
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“We will continue to follow the law, stand up for the sovereignty of our state, and protect the people of Illinois.”
Officials familiar with the proposals told the Post that several options were being weighed up by the US defence department, including mobilising thousands of National Guard troops in Chicago as early as September.
The Pentagon said it would not comment on planned operations, adding: “The department is a planning organisation and is continuously working with other agency partners on plans to protect federal assets and personnel.”
Image: People protest against President Donald Trump’s use of federal law enforcement and National Guard troops in Washington DC. Pic: AP
Mr Trump, however, told reporters on Friday that “Chicago is a mess,” before attacking the city’s mayor Brandon Johnson and hinting “we’ll straighten that one out probably next”.
Mr Johnson has not yet commented on Saturday’s reports, but said on Friday that the president’s approach to tackling crime has been “uncoordinated, uncalled for and unsound”.
“There are many things the federal government could do to help us reduce crime and violence in Chicago, but sending in the military is not one of them,” he added.
It comes after around 800 National Guard troops were deployed in Washington DC earlier this month, despite the US capital’s mayor revealing crime in the capital was at its “lowest level in 30 years”.
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What’s it like having the army on DC’s streets?
According to preliminary figures from Washington DC’s Metropolitan Police, violent crime is down 26% in 2025 – after dropping 35% in 2024 compared with 2023.
In June Mr Trump ordered 700 US Army marines and 4,000 National Guard troops to Los Angeles in California, during protests over mass immigration raids.
The family of Virginia Giuffre, who was one of Jeffrey Epstein’s most prominent sex trafficking accusers, have said they are “outraged” over the US Department of Justice’s release of an interview with Ghislaine Maxwell.
Maxwell – a convicted sex trafficker and ex-girlfriend of the deceased paedophile financier Epstein– refuted several claims of child sex trafficking and abuse during the two-day-long interview with Deputy Attorney General Todd Blanche in July.
Reacting after the transcripts of the interview were released on Friday, Ms Giuffre’s family said it gave Maxwellthe “platform to rewrite history” and showed she was “never challenged about her court-proven lies”.
“As the family of one of the most prominent survivors, Virginia Roberts Giuffre, we are outraged,” they said in a statement.
“The content of these transcripts is in direct contradiction with felon Ghislaine Maxwell’s conviction for child sex trafficking.”
Image: Virginia Giuffre was one of Jeffrey Epstein’s most prominent accusers. File pic: AP
Ms Giuffre’s family added: “This travesty of justice entirely invalidates the experiences of the many brave survivors who put their safety, security, and lives on the line to ensure her conviction, including our sister.”
Referencing Maxwell’s move to a minimum-security facility in Texas earlier this month, they said it “sends a disturbing message that child sex trafficking is acceptable and will be rewarded”.
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“We continue to call upon the DOJ (Department of Justice) to do its job by investigating and holding accountable the many rich and powerful people who enabled Ghislaine Maxwell’s and Jeffrey Epstein’s crimes,” they concluded.
Ms Giuffre, who died by suicide in April, had previously claimed that Maxwell introduced her to Epstein and hired her as his masseuse, before she was sex trafficked and sexually abused by him and associates around the world.
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Virginia Giuffre dies by suicide
She sued Prince Andrew for sexual abuse in August 2021 – saying he had sex with her when she was 17 and had been trafficked by Epstein.
The duke has repeatedly denied the claims, and he has not been charged with any criminal offences.
In March 2022, it was announced Ms Giuffre and Andrew had reached an out-of-court settlement – believed to include a “substantial donation to Ms Giuffre’s charity in support of victims’ rights”.
During her interview with Mr Blanche last month, Maxwell said Ms Giuffre’s allegation against the duke “doesn’t hold water”, and denied ever introducing Epstein to him or Sarah Ferguson.
Image: Prince Andrew and Virginia Roberts in 2001. Pic: Shutterstock
She insisted Epstein and Andrew met separately, and said “I think Sarah [Ferguson] is the one that pushed that”, before saying that allegations Andrew had sex with Ms Giuffre were untrue, as she was at her mother’s 80th birthday celebrations in the countryside outside the city.
Maxwell then claimed Ms Giuffre’s allegation that she and Andrew had sexual contact in the bathroom of her London flat was not true, as the room was not big enough.
She also claimed that an image of her standing alongside Andrew with his arm around Ms Giuffre’s waist was “literally a fake photo”.
During the interview with Mr Blanche, Maxwell denied ever seeing US President Donald Trump in an “inappropriate setting” and insisted she was not aware of any Epstein ‘client list’.
Under growing pressure to release files related to Epstein, as he promised to do during his 2024 presidential campaign, Mr Trump has made a series of denials and claims about the paedophile financier.
In July, the president told reporters on Air Force One that Epstein “stole” Ms Giuffre and other young women from his Mar-a-Lago resort in Florida.
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Trump claims Epstein ‘stole’ Virginia Giuffre
Mr Trump has also floated a pardon for Maxwell, saying earlier this month that “nobody” had asked to but insisted that he has “the right to do it”.
“I’m allowed to do it, but nobody’s asked me to do it. I know nothing about it,” he added. “I don’t know anything about the case, but I know I have the right to do it.
“I have the right to give pardons, I’ve given pardons to people before, but nobody’s even asked me to do it.”
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Maxwell was sentenced in the US in June 2022 to 20 years in prison following her conviction on five counts of sex trafficking for luring young girls to massage rooms for Epstein to abuse. She has asked the US Supreme Court to overturn her conviction.
Epstein, 66, was found dead in his cell at a Manhattan federal jail in August 2019 as he awaited trial on sex trafficking charges. His death was ruled a suicide.
His case has generated endless attention and conspiracy theories due to his and Maxwell’s links to famous people like royals, presidents and billionaires, including Mr Trump.
No one other than Epstein and Maxwell has been charged with any criminal offences.