The outbreak of hantavirus on the Dutch cruise ship MV Hondius has laid bare severe weaknesses in the United States public health system, with experts warning that cuts to agencies and staffing have left the country dangerously exposed not only for this outbreak but for any future pandemic of a more dangerous pathogen.
Over the past two years, federal health agencies have been hollowed out. Staff have been laid off or fired, key posts remain vacant, and entire divisions have been paused. The consequences are now visible: the US Centers for Disease Control and Prevention (CDC) has been slow to communicate, has not created a public resource page for the hantavirus, and has not held any briefings or sent senior officials to television to explain the risk to Americans. “A CDC crew would have been with them, or at least been offered. Now they’re nowhere to be found,” said Boghuma Titanji, an infectious disease physician and assistant professor at the Emory School of Medicine, referring to the European health workers deployed to the ship.
The US Department of State is leading the domestic response – a highly unusual arrangement, according to Titanji, because the CDC typically takes charge of health coordination during outbreaks. The only CDC press release on the issue, issued on Wednesday evening after days of silence, said State officials were in “direct contact” with passengers and coordinating with domestic and global health bodies. A CDC official told the Guardian the agency was “aware of the reports of hantavirus on a cruise ship and is providing technical input and guidance as requested”. The CDC did not grant a request to speak with a hantavirus expert and did not answer questions about testing capacity, precautions for returning passengers, or support for local health providers.
The damage to US public health infrastructure has been deep and broad. All full-time CDC cruise ship inspectors were unexpectedly laid off last year while investigating two separate outbreaks. Laboratory capacity has been gutted: it is not clear whether the US has working tests for hantaviruses. States can no longer send samples to the CDC for orthopoxvirus testing, including mpox, because that division has been temporarily paused. Labs have also lost the ability to test for leishmaniasis parasites, and rabies testing at the CDC was temporarily halted in April. “We’re losing that type of support,” Titanji said, recalling that for rare diseases a physician might encounter only once or twice in a career, the first step has always been to call the CDC for advice.
Virological research has come under intensely politicised scrutiny. The White House issued an executive order in May to curb research on viruses, and the National Institutes of Health made sweeping cuts to such work. Lawmakers have introduced bills to restrict what they loosely term “gain-of-function” research. Meanwhile, the scientific consensus on the origins of SARS-CoV-2 points strongly to a spillover from animals into people, but officials continue to investigate a lab-leak scenario, and some scientists are now facing subpoenas, arrests and prosecution. “We should be investing in doing more to understand how these spillover events take place – and that’s actually the very opposite of what’s going on at the moment,” said Bill Hanage, professor of epidemiology at the Harvard TH Chan School of Public Health.
The erosion of public health authority extends beyond Washington. More than half of US states have passed laws that restrict health officials’ ability to require quarantine and isolation or recommend masks; some schools are now forbidden from requiring certain vaccines for attendance and cannot shut down during another health crisis. These laws, many passed in response to the COVID-19 pandemic, weaken the collective ability to respond to new threats.
The MV Hondius outbreak
The MV Hondius, a Dutch-flagged cruise ship, departed Ushuaia, Argentina, on 1 April 2026. Passengers disembarked at various stops, including St. Helena on 24 April, before the outbreak was identified. By the time officials confirmed the presence of hantavirus, travellers from 12 countries – including the United States – had already returned home.
As of Thursday, officials reported three suspected and five confirmed cases of Andes virus, a strain of hantavirus found in South America. By 8 May, global health authorities put the tally at five confirmed and four suspected cases. Three people have died, and three have been hospitalised, including some in intensive care, though those patients are showing signs of improvement. One of the patients, a Dutch flight attendant, tested negative for Andes virus, according to Inside Medicine. Among British nationals, the UK Health Security Agency has confirmed two cases and one suspected case, and is supporting those affected. Switzerland has identified one case in a former passenger being treated in Zurich.
Andes virus is primarily spread through contact with infected rodents – specifically the long-tailed pygmy rice rat, which is found only in South America. However, it is unique among hantaviruses in its capacity for limited human-to-human transmission, typically through very close and prolonged contact. Symptoms can appear two to eight weeks after exposure and begin with fever, fatigue and muscle aches, before sometimes progressing to Hantavirus Pulmonary Syndrome, a life-threatening respiratory condition. There is no licensed antiviral treatment or vaccine; care is supportive.
The World Health Organization (WHO) has been coordinating the international response. Maria Van Kerkhove, WHO director of epidemic and pandemic management, said at a briefing on Thursday: “This is not Covid, this is not influenza. It spreads very, very differently. This is not the same situation we were in six years ago.” The WHO is narrowing in on human-to-human transmission, with spread so far limited to those who had close contact with patients. Van Kerkhove said the pattern mirrors an outbreak in Epuyén, Argentina, in 2018–2019, where 34 people tested positive and 11 died. “We believe that’s happening” in this case as well, she said, with transmission from the first two patients to close contacts, including a doctor who treated them on the ship.
The European Centre for Disease Prevention and Control deployed two Dutch physicians and an infectious disease expert to provide medical and psychosocial support on the cruise ship. The US, which under the Trump administration has withdrawn from the WHO, has been conspicuously absent from the global health response, experts say. The US Department of State is now leading the American effort, a role that would ordinarily fall to the CDC. According to CNN, the CDC is dispatching staffers to meet the ship in the Canary Islands and has made plans to escort American passengers back to the United States aboard a charter flight – potentially a specialised aircraft with a biocontainment unit. A separate CDC team has been sent to Nebraska, where passengers are expected to be placed into quarantine. Several states are monitoring returning residents: Georgia is monitoring two, California an undisclosed number, Arizona one, and New Jersey two individuals who may have been exposed while flying abroad. None of these individuals are currently showing symptoms.
Pandemic preparedness under strain
While the risk to the general public remains near zero, the response to the hantavirus outbreak has exposed dangerous cracks in the system that could prove catastrophic if a high-consequence pathogen emerges. Titanji said: “If we had a significant outbreak of a high-consequence pathogen, it would be very, very concerning to see what the response and the leadership of that response would be.”
Misinformation about the outbreak is already swirling – including fears of another pandemic – amplified by social media where some are framing hantavirus as “COVID 2.0”. Conspiracy theories involving lab leaks and pharmaceutical profiteering have resurfaced. The relative silence from US officials has made matters worse. “It just fuels the public anxiety,” Titanji said. “People are still reeling from the trauma that was Covid-19, and a lot of people who experienced that still have a degree of PTSD. So it’s very hard to not spiral.”
Trust in public health guidance has been badly eroded. “Everything that we know about both this outbreak and previous ones indicates that this is controllable, and I expect that it will be controlled,” Hanage said. “How long it will take to be controlled is another question. The appetite for that control will be a major part in deciding how easily it’s done and how long it ultimately takes.” He stressed the need for “extremely aggressive contact tracing of everybody who left the boat” and quarantine, but noted that multiple jurisdictions and authorities make coordination harder than in the Argentina outbreak.
The United States has not yet withdrawn from the International Health Regulations, meaning it still receives all the latest technical information. Abdirahman Mahamud, an infection prevention control specialist at the WHO, said: “In terms of collaboration with US and US institutions, it has been going very well. The information flow is there, transparent and frank.” However, he added that “this outbreak has seen why the world needs a global entity that coordinates” the response. In July 2025, the US formally rejected amendments to the IHR, citing sovereignty concerns.
Van Kerkhove noted that public health action was already working: the patient in Switzerland was identified precisely because of outbreak investigation and contact tracing. Mahamud said that if countries follow the lessons from Argentina – contact tracing, isolation and quarantine – “we can break this chain of transmission”.
WHO Director-General Tedros Adhanom Ghebreyesus expressed hope that the US and Argentina would reconsider their decisions to leave the organisation. “Any vacuum, any space which is not covered, actually gives advantage to the virus. And the best immunity we have is solidarity,” he said.