Some words feel different after 2020. "Outbreak." "Cruise ship." "International evacuation." "WHO press conference." Our brains learned to wire all of these to one single thing. And when we hear about hantavirus in the past few weeks, it's hard not to feel that familiar tightness in the chest. Let's talk about this calmly.
I'll be honest with you. The first time I read the news, I stopped. A ship drifting in the Atlantic. Passengers from twenty-three nationalities. Three deaths. An evacuation coordinated with twenty-two countries. An "unprecedented" landing in Tenerife. The phrase that wouldn't leave my head — and I'm guessing didn't leave yours either — was simply: again?
It's a fair reaction. We spent five years looking at every new infectious disease story with different eyes. We learned, the hard way, that the world catches things fast. That planes and cruise ships are test tubes with people inside them. That when the WHO calls a "public health event," it's rarely good news.
But precisely because that lesson cost us so much, it's worth using it well. And using it well, in this case, means looking at hantavirus carefully — not dismissing it as "just another scare," but also not mentally gluing it to COVID just because the ingredients of the news story rhyme.
Let me try to tell you what I've learned these past few days, and why I've come to the conclusion that this is, in the end, a very different story.
The cinematic coincidence of the MV Hondius
Let's start with what's actually happening right now. On April 1st, a Dutch ship called the MV Hondius left Ushuaia, at the southern tip of Argentina, with 147 people on board. It was an expedition cruise — the kind people pay small fortunes for, to see Antarctica, lost islands in the South Atlantic, places that barely have names on regular maps.
Ten days later, on April 11th, a 70-year-old Dutch passenger died on board. His wife, who had disembarked in Saint Helena, would die a few days later in a hospital in Johannesburg. A third person, a German woman, also died on the ship in early May. Only then, with tests done in South African and Dutch laboratories, did we confirm what was behind it all: hantavirus, the Andes strain — the only one known to spread, in rare cases, from person to person.
The ship docked in Tenerife in the early hours of today, in what the Spanish Health Minister called an unprecedented operation: passengers transferred directly to the airport, no contact with anyone, dispersed onto planes from various countries. Portugal has one citizen on board, a crew member.
If you feel a chill because all of this sounds eerily familiar, you're not making it up. Your brain is doing its job. In February 2020, the name everyone learned was Diamond Princess — another cruise ship, that time off the coast of Japan, which became the first major international focus of COVID. There are echoes here. But like echoes often do, they trick us.
Where the two viruses look alike (and where they don't look alike at all)
Let me tell you what I know, in plain language, because I think everyone deserves this conversation without having to read scientific papers.
What looks alike: It's a virus. It kills a significant percentage of infected people if the disease takes a bad turn. The first big global wake-up call came from a ship. There's international coordination trying to stop dispersal. The WHO is involved. People are in quarantine in multiple countries. Newspapers are using the word "outbreak."
What's radically different: Almost everything else.
COVID-19 spreads through the air between humans with brutal efficiency — sharing a poorly ventilated room for half an hour is enough. Hantavirus, in the vast majority of cases, spreads from rodents to people, not from people to people. You catch it by inhaling microscopic particles found in the urine, droppings, or saliva of infected wild mice and rats. For example, by sweeping out a cabin that's been closed for months, by handling old straw, by cleaning an abandoned barn.
The only strain known to spread between humans is precisely the Andes — the one in this outbreak — and even that transmission is rare and requires close, prolonged contact, usually between family members or caregivers. It's not the easy contagion of coronaviruses. It's not one person walking through a supermarket and infecting thirty others. It's a different beast.
The WHO itself, in its assessment published this week, classified the risk to the global population as low and said explicitly that it does not expect anything resembling a COVID-style epidemic. Portugal's health authorities said the same for our country: very low risk.
And there's another difference no one should forget: COVID was a new virus that nobody knew in January 2020. Hantavirus has been described for decades. Doctors know what it is. Labs know how to identify it. There are 38 known species, about 24 of which can cause disease in humans. There are studies. There are protocols. There is surveillance. The difference between facing an unknown enemy and facing an enemy we've already studied is, in public health terms, enormous.
So why is this happening now?
This, to me, is the most unsettling part of the story — and the one that has less to do with the ship than with the land. Because the MV Hondius was a spectacular event, that much is true. But what's happening on solid ground, on the other side of the Atlantic, is what should really make us think.
Argentina is going through the worst hantavirus season on record. The numbers, released a few days ago by the Argentine Ministry of Health, are stark: 101 confirmed cases in the 2025-2026 season, with 32 deaths. A fatality rate above 31%. For comparison: the previous season had 57 cases. Two seasons before that, 75. The curve has climbed. And Argentine researchers don't dodge the explanation: climate change, habitat destruction, urbanization advancing into formerly wild zones.
The reasoning is simple, and read slowly, it's disturbing. A warmer, more humid climate makes plants produce more seeds. More seeds feed more mice. More mice spread into more areas, including places they weren't found before. More mice means more contact with people. More contact means more infections.
This is, deep down, one of the most difficult messages of the past few years: many of the viruses that worry us — dengue, chikungunya, zika, West Nile, hantavirus — aren't becoming more dangerous. What's changing is the world they live in. And we, without meaning to, are getting closer to them.
The virus isn't coming to us. We are going to it.
What about us, here at home?
I'll be direct, because that's probably what you want to know. In Portugal, there isn't a single confirmed human case of hantavirus to this day. The National Health Institute regularly tests rodents in different parts of the country and has never found an infected animal. The same is true in Spain. The most dangerous strains of hantavirus thrive in cold, humid climates, and our Mediterranean climate — dry summers, heatwaves, mild winters — isn't their preferred environment.
The Health Minister said it bluntly this week: very low risk, no widespread transmission expected.
But — forgive my insistence on this but — the one thing we learned from COVID, from dengue showing up in southern Europe, from new mosquitoes colonizing the continent, is that the phrase "that doesn't happen here" has an increasingly short expiration date. Not to fake alarm. To be honest with what we know.
What I'm asking of you, after all this
If you've read this far, thank you. And I want to ask you three things, because they feel more important to me than a thousand statistics.
The first: don't think this is COVID all over again. It isn't. The evidence we have — the biology of the virus, the way it spreads, our prior knowledge, our ability to respond, the WHO's own assessment — all points the other way. The tightness you feel is real, but it's memory, not prediction.
The second: don't dismiss the signal. What happened on the MV Hondius is, in a way, a warning coming from very far away. What's happening in Argentina is a warning coming from closer than it looks. Climate change is redrawing the map of infectious diseases, and that's no longer the hypothesis of eccentric scientists. It's documented reality.
The third, and simplest: live. Go for hikes. Visit old barns if you feel like it. Travel to Patagonia if it's the dream of your life. Take the basic precautions — air out spaces that have been closed for a long time, don't dry-sweep places where rodents might have been, see a doctor if you get a high fever with severe muscle pain after a trip to a rural or wild area. But don't trade your life for fear. That's what the pandemic stole from us too many times, and that was the cruelest theft of all.
The passengers of the MV Hondius boarded to see the end of the world. They came back with a story that, ironically, is about how the world is coming together — climate, animals, people, viruses, all closer than we used to think. Maybe that's the real lesson. Not that another pandemic is coming. But that the planet has fewer and fewer sealed compartments, and that this forces us to think more carefully about what we still call "far away."
Take care of yourself. And breathe deeply — this time, in the literal sense.