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The Brief

The most important stories for you to know today
  • Science agency fears cuts
    The National Oceanic and Atmospheric Administration includes the National Hurricane Center, which researches hurricanes and provides weather updates and forecasts for the dangerous storms. Employees at the agency are worried the Trump administration will cut support for their work.
    The National Oceanic and Atmospheric Administration includes the National Hurricane Center, which researches hurricanes and provides weather updates and forecasts for the dangerous storms. Employees at the agency are worried the Trump administration will cut support for their work.

    Topline:

    Federal workers at the National Oceanic and Atmospheric Administration are on high alert as they monitor signs of a potential Trump administration overhaul of one of the government's main scientific agencies.

    What NOAA does: NOAA includes offices that study the ocean and atmosphere, forecast the weather at the National Weather Service and manage the country's oceanic fisheries.

    Where things stand: Many employees are bracing for potential staff cuts, as well as slashes to the funding that supports science within the agency and by many research partners across the country.
    NOAA staffers are concerned about how President Trump's executive orders, including one targeting climate change programs, could affect the agency's research and operations.

    Federal workers at the National Oceanic and Atmospheric Administration are on high alert as they monitor signs of a potential Trump administration overhaul of one of the government's main scientific agencies.

    Many employees are bracing for potential staff cuts, as well as slashes to the funding that supports science within the agency and by many research partners across the country.

    In particular, NOAA staffers are concerned about how President Trump's executive orders, including one targeting climate change programs, could affect the agency's research and operations. Agency officials have received a list, which NPR has viewed, of terms that could run afoul of the orders in the grants and programs they manage; the list includes terms like "climate change," "pollution" and "natural resources," as well as many terms associated with diversity, equity and inclusion. NPR obtained the list from an official at NOAA who agreed to talk on the condition of anonymity for fear of retribution.

    NOAA did not respond to NPR's request for comment.

    What NOAA does — and how that might change under the Trump administration

    NOAA includes offices that study the ocean and atmosphere, forecast the weather at the National Weather Service and manage the country's oceanic fisheries.

    "If you are a recreational boater, you use NOAA charts. If you like fish, you're eating fish that NOAA manages. If you are concerned about severe weather events, that information — whether it be flooding, tornadoes or tsunamis or hurricanes — that information is tracked by, analyzed by and put into forecasts by NOAA," says Andy Rosenberg, a former NOAA official.

    The "Project 2025" plan, a 900-plus page blueprint for governing produced by conservative groups led by the Heritage Foundation, called NOAA "one of the main drivers of the climate change alarm industry." It suggested breaking the agency up, slashing its budget and privatizing much of its weather forecasting work.

    We want to hear from you

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    Trump – who often distanced himself from the Project 2025 plan during the campaign — has placed some of the project's authors into prominent staff roles in his administration and issued a bevy of executive actions that closely mirror its recommendations.

    Previous administrations have discussed moving NOAA from its current home in the Department of Commerce to another part of government, or breaking apart its different arms: for example, officials have previously explored the idea of moving the National Marine Fisheries Service, a branch of NOAA, to the Fish and Wildlife Service. And Trump showed interest during his first administration in privatizing weather forecasting and technology.

    "The mood's lower than I've ever seen it" 

    NPR spoke with several NOAA employees who requested anonymity for fear of retaliation at work. They said they are concerned that the Trump administration will impede the agency's scientific work as part of the push to cut government costs by Elon Musk's team within the Trump administration known as the Department of Government Efficiency. Some staffers are watching to see if NOAA continues to issue, for example, its closely watched reports on weather and climate, which often influence economic activity across the globe.

    "The mood's lower than I've ever seen it," a NOAA contractor tells NPR. "There's a lot of fear in the office."

    Career civil servants at NOAA are also awaiting the likely return of Neil Jacobs, an atmospheric scientist who served as NOAA's acting head during the first Trump administration. Trump has nominated Jacobs to be the agency's next leader.

    Jacobs is a weather modeler respected by many peers and is currently a fellow at the American Meteorological Society, a prestigious professional association of meteorologists. But he was also cited for misconduct by an independent expert panel of the National Academy of Public Administration after following the "Sharpiegate" incident in 2019. In the incident, Trump incorrectly stated Hurricane Dorian would affect Alabama, a state outside its forecasted track. NOAA, under Jacobs' leadership, later released an unsigned statement backing up Trump's incorrect claims.

    Another new nominee to a key NOAA leadership position, Taylor Jordan, is also well-versed in weather forecasting and technology, says Craig McLean, a former NOAA official who served across several previous administrations. The nomination is slightly unusual, says McLean, because historically, the two leadership positions to which Jordan and Jacobs have been nominated would be held by a weather expert and an expert on coasts or fisheries.

    A new commerce secretary could influence NOAA's future

    Potential new leadership at NOAA's parent agency, the Commerce Department, is also raising questions about NOAA's future. Democratic lawmakers on the Senate Commerce Committee have been pressing Trump's commerce secretary nominee, Howard Lutnick, on his plans for the agency in light of Project 2025's call for the end of NOAA.

    Advocates of NOAA have raised the alarm about how shutting off public NOAA data that informs daily weather forecasts, wildfire alerts and hurricane tracking could have dire consequences on people's lives and the country's economy.

    "In a world where catastrophic climate change impacts and extreme weather events are becoming more frequent and intense, I can think of nothing worse than turning this scientific powerhouse into a skeletal operation," Juan Declet-Barreto, senior social scientist for climate vulnerability at the Union of Concerned Scientists, said in a statement. "If President Trump moves forward with demolishing NOAA, he will jeopardize most people's access to life-saving information, while only the rich might be able to afford private data sources."

    Asked by Sen. Maria Cantwell of Washington, the committee's top Democrat, whether NOAA should be dismantled, Lutnick said in a written response that "it is premature to discuss any specific recommendations before engaging with NOAA and the Office of Management and Budget," as well as the Commerce Department and Trump.

    All Republican lawmakers on the committee, plus Democratic Sen. John Fetterman of Pennsylvania, voted to advance Lutnick's nomination last week largely along party lines.

    NPR climate reporter Julia Simon contributed reporting.

    Edited by Sadie Babits, Neela Banerjee and Benjamin Swasey

    Copyright 2025 NPR

  • Record amount for breaking privacy law
    a parking lot full of chevrolet cars
    A Chevrolet Bolt EV sits parked in the sales lot at Stewart Chevrolet in Colma on April 25, 2023.

    Topline:

    General Motors agreed to pay $12.75 million in civil penalties for selling driving data of hundreds of thousands of California motorists to data brokers, allegedly without their consent.

    Background: It stemmed from an investigation by California Attorney General Rob Bonta, several county district attorneys, and the California Privacy Protection Agency, which enforces the privacy act. They said General Motors misled drivers who paid for the emergency roadside and navigation service OnStar and made approximately $20 million from the unlawful sale of their data between 2020 and 2024. The information included names, location information, driving behavior, and contact information, Bonta said, which went to the data brokers LexisNexis Risk Solutions and Verisk Analytics.

    Read on ... for more on GM's actions and the penalty.

    General Motors agreed to pay $12.75 million in civil penalties for selling driving data of hundreds of thousands of California motorists to data brokers, allegedly without their consent.

    The settlement, announced Friday, is the largest ever for violations of the California Consumer Privacy Act, a 2018 law that requires companies to tell consumers about how their data is shared and to respect requests to stop the sharing.

    It stemmed from an investigation by California Attorney General Rob Bonta, several county district attorneys, and the California Privacy Protection Agency, which enforces the privacy act. They said General Motors misled drivers who paid for the emergency roadside and navigation service OnStar and made approximately $20 million from the unlawful sale of their data between 2020 and 2024. The information included names, location information, driving behavior, and contact information, Bonta said, which went to the data brokers LexisNexis Risk Solutions and Verisk Analytics.

    “This trove of information included precise and personal location data that could identify the everyday habits and movements of Californians,” Bonta said in a press release.

    The settlement also requires GM to stop selling data to any consumer reporting agencies for five years and submit privacy assessments to the state, among other provisions. It followed a similar agreement between the Federal Trade Commission and GM earlier this year and California settlements with Honda and Ford over the past 14 months for their own violations of the privacy act.

    California’s investigation of GM began after a 2024 New York Times investigation found GM collected data about millions of drivers nationwide and sold it to insurance companies in order to charge the drivers higher premiums. Californians were not impacted by those premium hikes because a state law prohibits insurers from using driving data to set insurance rates, Bonta said.

    Bonta told CalMatters at a press conference Friday that it’s unclear if location data collected by General Motors was used by other companies to make predictions about the prices people are willing to pay for goods. That practice is better known as surveillance pricing and can leverage location data. Target paid $5 million to settle a suit from San Diego County’s district attorney over its alleged use of location for the technique. Bonta’s office began an investigation into the surveillance pricing practices of businesses in January.

    “I understand that there could be some overlap and maybe we'll discover something in our investigation in surveillance pricing, but that wasn't the focus of this case,” he said.

    Los Angeles District Attorney Nathan Hochman said the case started with one person finding location data in a report they requested about the data collected on them. That discovery, he added, led to investigations by journalists, prosecutors, and regulators.

    “This case shows more than anything that one consumer can make a huge difference,” he said.

    Though the settlement isn’t much compared to the $2.7 billion in net income that General Motors made last year, Hochman called it an indication that companies should expect higher penalties in the future. California reached a privacy law violation settlement with Disney in February for $2.75 million, previously the largest of its kind.

    In a statement shared with CalMatters, General Motors spokesperson Charlotte McCoy said, “This agreement addresses Smart Driver, a product we discontinued in 2024, and reinforces steps we’ve taken to strengthen our privacy practices. Vehicle connectivity is central to a modern and safe driving experience, which is why we’re committed to being clear and transparent with our customers about our practices and the choices and control they have over their information.”

    Californians will soon have a new protection against companies that use their data without their consent. Starting August 1, the more than 500 data brokers registered with the state must comply with requests California residents can make using an online tool known as the Delete Request and Opt-out Platform, or DROP. The privacy protection agency introduced the tool earlier this year.

    This article was originally published on CalMatters and was republished under the Creative Commons Attribution-NonCommercial-NoDerivatives license.

  • Sponsored message
  • No plans to reopen to the public
    two people pulling suitcases walk on the sidewalk by a chain-link fence with a lot of green trees around
    Pedestrians walk along Wilshire Boulevard adjacent to RFK Community Park in Koreatown that is currently fenced in April 22 in Los Angeles

    Topline:

    The Los Angeles Unified School District fenced off RFK Inspiration Park, located on Wilshire Boulevard. Nearly a year later, the district is considering reopening the space, but only to students at the adjacent RFK Community Schools.

    Why now? Enrique Legaspi, assistant principal at RFK Community Schools, said the school and the district are discussing using the park again, including for classes and student activities. LAUSD confirmed that school leaders have expressed strong interest in using the space for outdoor learning, art programs and student wellness activities.

    Background: For years, the city’s Department of Recreation and Parks operated and maintained the park under an agreement with the school district dating back to 2010. At the time, the public was allowed to use the space. Last March, the department stepped away. By then, it had already been taking on costs outside what the 2010 agreement required.

    Read on ... for more on the battle over the park.

    For nearly a year, people walking down Wilshire Boulevard in Koreatown have passed a small patch of what used to be one of the few public park spaces in the neighborhood. It’s now locked behind a tall chain link fence.

    Inside, the grass is overgrown and trash is piled up along the edges. The memorial to Sen. Robert F. Kennedy — built at the site where he was assassinated in 1968 at the Ambassador Hotel — has fallen into disrepair.

    The Los Angeles Unified School District fenced off RFK Inspiration Park, located on Wilshire Boulevard. Nearly a year later, the district is considering reopening the space, but only to students at the adjacent RFK Community Schools.

    That’s frustrating for some neighbors, who say the park used to belong to everyone.

    “I remember the park being open and suddenly a few months after, it was gated,” said Vanessa Aikens, who lives a few blocks away. “I was just wondering why they gated the area because there seemed to be a lot of people interacting with it.”

    There has been little information relayed to the community about why.

    “We have a number of our members who live right around there and so there’s an angle of access to green space, the access to a safe space for our homeless neighbors,” said Yuval Yossefy, treasurer of Ktown for All, an all-volunteer grassroots organization serving Koreatown’s unhoused community. “This went basically unnoticed.”

    Enrique Legaspi, assistant principal at RFK Community Schools, said the school and the district are discussing using the park again, including for classes and student activities. LAUSD confirmed that school leaders have expressed strong interest in using the space for outdoor learning, art programs and student wellness activities.

    Officials plan to involve the school community and nearby residents as plans take shape, but they have not given a timeline or said whether the park will reopen to the public.

    Koreatown lacks parks

    For years, the city’s Department of Recreation and Parks operated and maintained the park under an agreement with the school district dating back to 2010. At the time, the public was allowed to use the space.

    Last March, the department stepped away. By then, it had already been taking on costs outside what the 2010 agreement required.

    “RAP communicated uncertainty about its ability to sustain long-term maintenance due to staffing and funding constraints,” said Deirdra Boykin, a department spokesperson.

    For people who live nearby, the loss of the park has been simple and immediate: there’s nowhere else like it.

    “There are no parks around where I live,” Aikens said. “Now I just walk straight down the street.”

    In a neighborhood with such limited park space, the memorial park went relatively unnoticed.

    “There definitely isn’t enough green space here,” said Emere Alademir, 23, who lives nearby. “I’m originally from Toronto and everywhere they have green space.”

    People who never used the park say they would visit if it reopened.

    “I’ve never actually gone in but I would be open to coming here if it reopens,” said Wendy Kim, 70, who has lived in the neighborhood for 40 years. “Why not? It’s good for everyone.”

    Kim, who splits her time between LA and Seoul, said the parks in Seoul are much better maintained than the ones in LA, and that when she craves nature, she travels out of the city for a hike.

    “But every place is different and here, the homeless issue is out of hand. That’s just the reality,” she said.

    The fence goes up

    Public records obtained by Yossefy and reviewed by The LA Local show that city and LAUSD officials coordinated the park’s handoff around a May 22 encampment removal and cleanup, after which LAUSD took control of the site and moved forward with fencing it off. The emails do not explicitly state that the park was fenced because unhoused people were there, but they show encampment removal was a central part of the transition plan.

    Volunteers with Ktown For All, who do weekly outreach to the unhoused community in the area, said they were used to seeing people at the park every Saturday.

    “It’s just like all of a sudden the fence was there,” said Nicolas Emmons, who has been doing outreach near RFK since around 2021.

    Emmons and others said that while some unhoused residents stayed in the park, the majority of the park was open and available.

    “At its peak, it was only a small percentage of the park that was being used by people to live in,” he said. “Some of the people that lived there even took it upon themselves to clean the area around their setup.”

    Eunice Jeon, another volunteer with the organization, said they had built relationships with people there over several years.

    “We regularly saw people there and had built relationships with people there,” she said. “They respected and treated the park well.”

    Jeon added that despite restricting access, the closure has not visibly improved the space.

    “If anything I would say the park is in worse state ever since the fence has gone up despite nobody being in there,” she said.

    Jeon said many individuals she encountered were navigating complex barriers to housing and services, often caught in bureaucratic loops that made it difficult to access help.

    “A lot of the time they’re limited by transportation. Some services don’t allow certain things. They need an address, but in order to get something mailed, they need their driver’s license, which they don’t have because they don’t have an address,” she said.

    In email chains included in the public records, officials also discussed installing permanent wrought iron fencing at the site. When asked if that remains the plan, LAUSD said the project is still in the “planning phase” and that details, including potential site features, have not been finalized.

    “If the park is fenced off, nobody can access it. It doesn’t provide you any use,” Yoseffy said. “There are a number of people that can’t access this park, whether they were sleeping in this park, or they used the park to exercise, if they liked to sit and read — none of those things can happen there anymore because it’s completely closed off.”

    Public records show little evidence of public notice. One email mentions posting notices at the park ahead of the cleanup, but there was no formal announcement made to residents that the park — which had been open to the public for years — would be closed and no longer accessible.

    “I think that a public space is meant to be used by the public, including the unhoused,” Jeon said. “That’s something they need to address instead of locking up the parks. That’s a failure of the city. Kicking them out won’t keep anyone safer if they have fewer and fewer places to go.”

    LA Local reporter Marina Peña contributed to this report.

  • What's next after widespread cyberattack

    Topline:

    Canvas, the learning platform used by half of North America's colleges including the UC system, is back online after a ransomware breach, but some schools are still locked out and finals are being postponed.

    Why it matters: Hackers said it stole data on 275 million users and have set a May 12 leak deadline. Stolen data reportedly includes names, emails, student IDs and private messages — but no passwords or financial info.

    Why now: The UC system says Canvas won't be restored until it's confirmed secure.

    The online education platform Canvas went offline after a data breach on Thursday, temporarily leaving students and faculty at thousands of U.S. colleges — and K-12 schools — without access to course materials and communications during finals period.

    "I'm sure somewhere in the country when the outage happened, there probably were people actually taking final exams on the platform when it crashed," says Damon Linker, a senior lecturer in political science at the University of Pennsylvania.

    Thirty million users — including at half of the higher education institutions in North America — rely on Canvas to manage courses, submit assignments, view grades and facilitate communication, according to its parent company, Instructure.

    But when Linker and many other users tried to do so on Thursday afternoon, they met a black screen and a warning message.

    "ShinyHunters has breached Instructure [again]," it read. "Instead of contacting us to resolve it they ignored us and did some 'security patches.'"

    ShinyHunters is the same entity that took credit for a massive Ticketmaster data breach in 2024. Like many such groups, it's a cluster of young people working remotely together, "kind of like a ransomware gang," says Rachel Tobac, the CEO of SocialProof Security, which trains people and companies to defend themselves against hackers.

    ShinyHunters wrote on a threat intelligence website earlier this week that the initial breach on Saturday involved data — including private messages — from 275 million students, teachers and staff at nearly 9,000 schools worldwide. The group said Thursday that affected schools can prevent the release of their data by consulting with cyber advisory firms and negotiating settlements through the encrypted chat platform Tox.

    "You have till the end of the day by 12 May 2026 before everything is leaked," the hackers wrote.

    Instructure has confirmed a series of cybersecurity breaches this week and provided status updates on its website. It said the breach only appeared to involve identifying information like names, email addresses, student ID numbers and user messages — no passwords, birth dates, government identifiers or financial information.

    Instructure confirmed on an FAQ page that it started an investigation after it first detected unauthorized activity in Canvas on April 29, and took Canvas offline on Thursday after that same unauthorized actor "made changes that appeared when some students and teachers were logged in." They said the actor exploited an issue with its Free-for-Teacher accounts, which it has temporarily shut down.

    "This gives us the confidence to restore access to Canvas, which is now fully back online and available for use," it said in a statement to NPR. "We regret the inconvenience and concern this may have caused."

    It's not clear whether Instructure paid a ransom or what the return of Canvas access could mean for the hackers' May 12 deadline.

    Tobac says Canvas could be back online because of a successful negotiation, or because the hackers "didn't get super far in their attack." Either way, she says users should stay vigilant, especially for phishing messages — whether it's someone posing as Canvas prompting a password change, or pretending to be a professor sending course materials.

    "I would operate under the assumption that there's going to be some knock-on effects here," she says.

    Not everyone got back online immediately 

    Just before midnight on Thursday, Instructure posted online that "Canvas is now available for most users," though two separate services, Canvas Beta and Canvas Test, remained in maintenance mode.

    Students and faculty at at least some schools were still unable to access Canvas on Friday — either because service had not yet been restored or because administrators warned them to stay away.

    Penn State University, for example, said Friday morning that while the school's Canvas access had been partially restored, it was "not yet ready for use."

    "Technical teams at Penn State are actively working to prepare the system for our community," it added. "As access is restored, Canvas integrations and related services will be brought back online in phases."

    Several schools have taken similar approaches, either temporarily disabling Canvas access or outright asking users to steer clear. The University of California said across its schools, "Canvas access will not be restored until we are confident the system is secure."

    And it's not just higher education: The Montgomery County Public School system in Maryland alerted families on Friday morning that even as service returned, it is "continuing to test and review systems before restoring access."

    Tobac says this could mean that schools think the attackers might still be within their systems, potentially stealing information like passwords and messages.

    "The attackers probably got some sensitive information and … [schools] don't want this information out online," she says.

    Many schools are urging users to be on high alert for any unsolicited emails or messages that appear to come from Canvas, especially those requesting login credentials, as Georgetown University warned. The University of Amsterdam — which says it's one of 44 Dutch educational institutions affected — also recommends people change their passwords on any other sites where they use the same one.

    Tobac also recommends using a password manager — to generate long, random passwords for each login — and turning on multi-factor authentication for all online accounts, not just Canvas. She says any student or professor who gets a suspicious call, text or email should "use another method of communication to verify what is authentic."

    "Even if there was no breach yesterday, I would say these are the things that I recommend you do," she adds, urging people to "be politely paranoid."

    The breach disrupts finals, highlights vulnerabilities

    Several schools affected by the breach have already postponed or outright scrapped some final exams, with others warning students and professors that they might need to do so.

    The University of Illinois is postponing all final exams and assignments scheduled through Sunday. Penn State canceled certain exams scheduled for Thursday night and Friday, saying it was working with faculty to "determine next steps for final grading" and urging students to check their emails (not Canvas) regularly in the meantime. And Baylor University delayed Friday exams and asked all faculty to send students "whatever study materials they have on their local computers to students as soon as possible."

    The breach has underscored how much of academia relies on a single, centralized platform.

    Linker, of UPenn, told NPR that he received an influx of panicked messages from students on Thursday afternoon when they suddenly couldn't access PowerPoints, readings and previous exams as they tried to study for Monday's final.

    "The problem with using a platform like Canvas is that most [students] are not going to have the readings available printed out or on their laptops," he explains. "It all lives on the online platform, and if that platform goes down, they have no way to access them."

    He told students on Thursday that he would upload the course materials to another platform (like Dropbox or Google Docs) if Canvas access wasn't restored by Friday morning. Fortunately, he says, it came back online shortly before 9 a.m. ET.

    But Linker says he has concerns about relying fully on Canvas in the future.

    "Given what this has exposed, the vulnerability involved and also the concern with the data breaches, I'm starting to rethink whether this is really a wise way to proceed," he says.

    One example of that is grading. Linker says Canvas makes it so easy to calculate and weigh students' scores — on individual assessments and overall — that it's come to function as a digital grade book. Going forward, he says he may start keeping an analog record of students' grades just in case.

    While Canvas does have competitors like Blackboard, Linker says he doesn't think any would be less vulnerable to a future breach. And Tobac agrees.

    "The problem is not that this one website had this cyber event, right? Because nothing in this world is unhackable," she says. "The thing that we have to think about is disaster recovery: How do we continue doing business when there is a cyber event, and how do we do our very best to keep the bad actors out?"

    Tobac says this week has shown that many institutions did not have a clear plan for how students and professors can be in touch and access course materials without Canvas. She said those plans should vary based on schools' different circumstances and schedules — which might explain why some are proceeding with finals as usual while others are scrapping exams altogether. But she'd like them to approach the immediate aftermath with one common goal.

    "We have to treat people with dignity and respect," Tobac says. "And I hope that that is something that the institutions do, within their timelines and constraints."
    Copyright 2026 NPR

  • How it works and why it matters

    Topline:

    An international team of disease detectives is now racing to connect with the more than two dozen passengers who disembarked the MV Honius cruise ship on the Atlantic island of St. Helena before the hantavirus outbreak was identified.

    Where they're looking: These individuals have flown across the world, including to the United States.

    Why it matters: The risk of further spread of this virus is low since it requires close and prolonged contact with an infected individual — and those infected seem to transmit the virus for only a brief period of time. But public health officials want to make sure the outbreak is contained.

    An international team of disease detectives is now racing to connect with the more than two dozen passengers who disembarked the MV Honius cruise ship on the Atlantic island of St. Helena before the hantavirus outbreak was identified.

    These individuals have flown across the world, including to the United States.


    The risk of further spread of this virus is low since it requires close and prolonged contact with an infected individual — and those infected seem to transmit the virus for only a brief period of time. But public health officials want to make sure the outbreak is contained.

    Here's how authorities are using the practice of contact tracing to contain the outbreak and keep the hantavirus from spreading.

    Contact tracing 101

    The concept of modern contact tracing dates to the 1930s and was part of an effort to stop the spread of syphilis. It involves locating the close contacts of anyone who may have been infected. "By identifying people who are at risk of infection," says Preeti Malani, an infectious disease physician at the University of Michigan, "you try to get ahead when people don't have symptoms yet with the goal of preventing the infection from continuing to propagate."

    This is a well-tested approach for containing an infectious disease. "It's the oldest tool in the epidemiologic toolbox," explains Malani. "We thought about this a lot early in the pandemic with COVID. But we also do contact tracing for sexually transmitted infections, for things like meningitis and even measles."

    Malani likens contact tracing to monitoring ripples in a pond, "trying to prevent those outer rings from propagating by isolating individuals and by identifying individuals who might be at risk of infection."

    The idea that "there's a time period where people don't have symptoms but could be harboring the virus, that's what contact tracing helps identify," says Malani.

    It starts by pinpointing someone with an infection or suspected infection of the disease in question — in this case, hantavirus. Epidemiologists then look to see with whom they've recently had close contact since these individuals are more likely to have been infected.

    This hunt for those with the greatest probability of infection is important. "Otherwise, it becomes an impossible web to contain because everyone is connected to everyone," says Boghuma Titanji, an infectious diseases doctor at Emory University. "So you have to stratify by high, intermediate and low-risk contacts."

    The next step involves public health agencies ordering precautions for those who are infected or who may be infected but aren't showing symptoms yet. Such measures may include quarantine, so that an individual doesn't come into contact with even more people — who may then become infected.

    One challenge that hantavirus presents is that its incubation period can last up to several weeks. In other words, "people take a long time to become symptomatic after they've been exposed," says Titanji. "Some of these primary contacts would have to be monitoring themselves for symptoms for up to 45 days to be at the tail end of that very long incubation period."

    Aboard and ashore

    The work isn't high-tech but it is painstaking, requiring officials to reconstruct the many interactions someone may have had over days or weeks.

    Onboard the cruise ship, "you might have an individual who is a source of an infection," says Titanji, laying out a hypothetical example. "And then they were sitting at a dinner table with one individual who then goes back to their cabin and shares a bed with their partner who has a conversation with someone else on the deck."

    Once someone disembarks the ship, the number of potential interactions can grow quite quickly. This is why officials were concerned when a KLM flight attendant fell ill after being aboard a flight with one of the infected cruise ship passengers. Fortunately, the flight attendant ultimately tested negative for hantavirus.

    Titanji is heartened by what she's seen playing out so far. "It seems like the international collaborative effort has been really robust and the mechanisms for containment are in place and underway," she says.

    Public health officials argue that contact tracing is a powerful approach that will reduce further spread. "We can break this chain of transmission," said Abdi Mahmoud, the director of the World Health Organization's health emergency alert and response efforts, at a press conference on Thursday.

    He has good reason to be confident. Contact tracing was vital during the fight against COVID-19 and helped end the Ebola crisis in Liberia, containing the epidemic there more than a decade ago. Some of the contact tracing even involved hours-long hikes through the jungle to a remote village.

    Authorities are hoping for similar success with this hantavirus outbreak.
    Copyright 2026 NPR