The virus's behavior appeared largely unchanged
From a laboratory in Geneva, a virologist born on the volcanic shores of Tenerife has done what no researcher had done before: read the complete genetic story of the Andes hantavirus strain that swept through a cruise ship, finding in its code both reassurance and warning. Francisco Pérez, shaped by the economic realities that have long drawn Canarian talent abroad, brought the tools of pandemic-era science to bear on a quieter but no less serious outbreak, producing intelligence that will guide how public health authorities understand and respond to the virus. His work is at once a scientific milestone and a human parable — of knowledge built in exile, of home felt most keenly from a distance.
- A passenger disembarking from the MV Hondius cruise ship arrived in Zurich carrying the Andes hantavirus, triggering an urgent diagnostic race across Swiss research institutions.
- With no established global genetic baseline for this pathogen — unlike the vast COVID-19 sequence libraries — every hour without a map of the virus left authorities navigating in the dark.
- Pérez and his Geneva team worked in parallel with University of Zurich researchers, coordinating a joint release to give public health officials the most complete picture possible by morning.
- The sequencing revealed the virus had changed little in eight years, its lethality and transmissibility appearing largely stable — a measured relief, not a cause for alarm.
- Behind the science sits a structural wound: the Canary Islands continue to lose their most capable researchers to better-resourced institutions abroad, with Pérez himself having built an entire life in Switzerland with no realistic path home.
Francisco Pérez was three thousand kilometers from Tegueste, the small Tenerife town where he grew up, when a patient arrived in Zurich carrying the Andes hantavirus — the same pathogen that had sickened passengers aboard the cruise ship MV Hondius. Working at the University Hospitals of Geneva, Pérez and his colleagues raced to sequence the virus's genetic code, producing the first complete mapping of this particular strain anywhere in the world, in parallel with researchers at the University of Zurich. The two institutions agreed to release their findings together the following morning.
What the genetic data revealed was cautiously reassuring. The strain bore close resemblance to one that had caused an outbreak in Argentina eight years earlier, with only minor mutations accumulated since — nothing to suggest the virus had grown more lethal or more transmissible. For epidemiologists reviewing the findings, the picture was one of relative stability. The genetic barcode Pérez helped decode became essential intelligence for anticipating how the outbreak would unfold.
Pérez's route to that Geneva laboratory had been carved by the same forces that have long drained the Canary Islands of scientific talent. He studied biology at the University of La Laguna, then moved to Barcelona for his doctorate, where viruses first captured his imagination. The pandemic brought him to Geneva on a postdoctoral fellowship validating diagnostic tests; a year later, he joined a specialized virology unit established to identify emerging diseases before they have names or protocols.
He notes that hantavirus has never received the intense genetic scrutiny that SARS-CoV-2 did — the data is thinner, the baseline less certain. The work on the MV Hondius outbreak was, in that sense, foundational.
Now nearly a decade into his Swiss life, with a wife who does not speak the local language and a career firmly rooted abroad, Pérez sees no clear path back to the islands. He returns every summer and every Christmas, and what he says he misses most is not the landscape but the people. A virus's genome can be read from any well-equipped laboratory in the world. The grammar of home is not so easily translated.
Francisco Pérez was three thousand kilometers from home when the call came in. The virologist from Tegueste, a small town on Tenerife's northern coast, was working at the University Hospitals of Geneva when a patient arrived in Zurich carrying something unexpected: the Andes hantavirus, the same pathogen that had sickened passengers aboard the cruise ship MV Hondius. It fell to Pérez and his colleagues to sequence the virus's genetic code—to map its identity at the molecular level, the way a fingerprint identifies a person. Within hours, working in parallel with researchers at the University of Zurich, they had produced the first complete genetic sequencing of this particular strain anywhere in the world.
Six years after the world had been consumed by a coronavirus pandemic, virology had found itself in an unexpected second act. The hantavirus outbreak was different in almost every way from COVID-19, yet for Pérez, the laboratory work felt familiar. He had cut his teeth on pandemic diagnostics, validating PCR and antigen tests during the height of the emergency. Now, with samples in hand and a mandate from the Swiss government to diagnose emerging diseases, he was doing something more: he was reading the virus's story written in its own genetic language.
What that story revealed was reassuring, if not entirely surprising. The Andes hantavirus circulating on the cruise ship bore striking similarities to a strain that had caused an outbreak at a birthday party in Argentina eight years earlier. The mutations it had accumulated in the intervening years were minor—not significant enough to suggest the virus had become more lethal or more contagious. Scientists and epidemiologists who reviewed the data once it was published could draw a measured conclusion: the virus's behavior appeared largely unchanged. The genetic barcode Pérez had helped decode became essential intelligence for understanding how the outbreak would likely unfold.
Pérez's path to this moment had been shaped by the same economic pressures that have hollowed out the Canary Islands of talent for years. He studied biology at the University of La Laguna, but within a year of graduating, his education pulled him eastward to Barcelona. The crowded avenues of the Catalan capital bore little resemblance to the quiet roads of his childhood village, but it was there, during his doctoral research, that he first felt drawn to viruses. They seemed to him fascinating—though he struggled then to articulate exactly why. His first real opportunity to work with emerging pathogens came during the pandemic, when the University of Geneva offered him a postdoctoral position validating diagnostic tests. A year later, he joined the virology laboratory at the university hospitals, a network of eight public hospitals and two clinics established in 2005 specifically to diagnose diseases that had no name yet, no established protocols, no institutional memory.
The work on the hantavirus was collaborative by necessity. As Pérez and his team were decoding the genetic information, researchers at the University of Zurich were doing the same. The two institutions agreed to release their findings together the following morning, a coordinated announcement that would give the scientific community and public health authorities the most complete picture possible. Pérez noted that genetic sequencing of hantavirus had been far less common than sequencing of SARS-CoV-2. During the pandemic, the coronavirus had monopolized scientific attention globally; samples arrived daily from patients around the world, creating a vast library of genetic sequences that allowed researchers to track mutations with precision. Hantavirus had never received that level of scrutiny. The data was thinner, the baseline less established.
Now, anchored in Switzerland with a wife who does not speak the local language and a life built over nearly a decade, Pérez has no plans to return to the islands. A move back would require both of them to find good work in Canarias—a condition that seems unlikely to materialize. Yet he maintains the rituals of connection: summer and Christmas holidays are sacred, reserved for trips home. He keeps up with news from the archipelago through friends and family, and he feels the pull of nostalgia often. What he misses most, he says, is the people. The genetic code of a virus can be read and understood from a laboratory in Geneva. The code of home is harder to translate across distance.
Citações Notáveis
During the pandemic, the whole world focused on one virus. Every lab, every country was sequencing COVID. Hantavirus never got that attention.— Francisco Pérez, on why hantavirus genetic data is less abundant than coronavirus data
What I miss most is the people.— Francisco Pérez, on his connection to the Canary Islands despite living in Switzerland
A Conversa do Hearth Outra perspectiva sobre a história
When you first saw the genetic sequence of this hantavirus, what struck you?
How similar it was to something we'd already seen. Eight years old, from Argentina, but the mutations were so minimal. It told us this wasn't a virus that had fundamentally changed its nature.
Does that make the outbreak easier to predict?
In some ways, yes. We could look at what happened in Argentina and have a reasonable sense of what to expect. But hantavirus is less studied than coronavirus. We don't have the same depth of data.
Why is that?
During the pandemic, the whole world focused on one virus. Every lab, every country, every hospital was sequencing COVID. Hantavirus never got that attention. It's always been rare, always been secondary.
Do you think about going back to Tenerife?
My wife doesn't speak Spanish. We'd both need to find work there. It's not realistic right now, even though I miss it constantly.
What do you miss most?
The people. You can do science anywhere. But the people—that's something you can't replicate.