B2 · Upper Intermediate
15 min
global healthpandemic preparednesswildlife and ecologyscience
Every Continent. All of Them.
El virus completó el mapa
Australia has just confirmed its first detection of H5N1 avian influenza in a wild seabird in Western Australia, meaning the virus has now reached every continent on Earth. Fletcher and Octavio dig into what this milestone means, why Australia was considered a biosecurity fortress, and what it reveals about how the world manages pandemic risk.
Australia acaba de confirmar su primer caso de gripe aviar H5N1 en un ave marina salvaje en Australia Occidental, lo que significa que el virus ya está presente en todos los continentes del planeta. Fletcher y Octavio exploran qué implica este hito, por qué Australia era considerada una fortaleza de bioseguridad, y qué nos dice sobre cómo el mundo gestiona el riesgo de pandemia.
6 essential B2-level terms from this episode, with translations and example sentences in Spanish.
| Spanish | English | Example |
|---|---|---|
| bioseguridad | biosecurity | Australia tiene una de las políticas de bioseguridad más estrictas del mundo. |
| cepa | strain (of a virus) | Esta cepa del virus es más peligrosa porque puede infectar a los mamíferos. |
| vector | vector (disease carrier) | Las aves migratorias son uno de los principales vectores de la gripe aviar. |
| vigilancia epidemiológica | epidemiological surveillance | La vigilancia epidemiológica mejoró mucho después de la pandemia de COVID. |
| llevar + gerundio | to have been doing something (for a duration of time) | El virus lleva décadas circulando entre las aves migratorias de todo el mundo. |
| mutar | to mutate | Si el virus muta de una manera que facilite la transmisión entre personas, el riesgo aumenta enormemente. |
Australia has spent decades telling the world it has the toughest biosecurity border on the planet.
This week, that story got complicated.
Exactamente.
Exactly.
Las autoridades australianas confirmaron el primer caso de gripe aviar H5N1 en el país, detectado en un ave marina salvaje en Australia Occidental.
Australian authorities confirmed the first case of H5N1 bird flu in the country, detected in a wild seabird in Western Australia.
Y lo más importante es que esto significa que el virus ya está presente en todos los continentes del mundo.
And the most significant thing is that this means the virus is now present on every continent in the world.
Every continent.
I kept reading that line twice.
Antarctica included, apparently.
Sí, la Antártida también.
Yes, Antarctica too.
Los científicos encontraron H5N1 en aves en la Antártida hace algunos años, lo cual fue una noticia muy perturbadora.
Scientists found H5N1 in birds in Antarctica a few years back, which was deeply unsettling news.
Pero Australia había resistido.
But Australia had held out.
Tenía controles muy estrictos, era uno de los pocos lugares del mundo que todavía no había registrado este subtipo del virus.
It had very strict controls, and it was one of the few places in the world that still hadn't recorded this subtype of the virus.
And now it has.
So before we get into what this actually means, walk me back.
H5N1 has been around for a while.
This isn't a new virus we're talking about.
No, para nada.
No, not at all.
El H5N1 se identificó por primera vez en aves acuáticas en el sur de China en 1996.
H5N1 was first identified in waterfowl in southern China in 1996.
Luego, en 1997, hubo un brote en Hong Kong que infectó a dieciocho personas y mató a seis.
Then in 1997 there was an outbreak in Hong Kong that infected eighteen people and killed six.
Fue la primera vez que se confirmó que este virus podía pasar directamente de las aves a los humanos, y el mundo entero se asustó.
It was the first confirmed case of this virus passing directly from birds to humans, and the whole world was frightened.
I was in Southeast Asia covering something else when the 2004 and 2005 outbreaks hit hard across Thailand, Vietnam, Indonesia.
I remember the feeling in every newsroom, every health briefing.
People were genuinely asking if this was the one.
Y tenían razones para preocuparse.
And they had reasons to worry.
La tasa de mortalidad entre las personas infectadas era aterradora, alrededor del cincuenta por ciento en algunos brotes.
The death rate among infected people was terrifying, around fifty percent in some outbreaks.
El problema es que el virus no se transmitía fácilmente entre personas.
The problem is that the virus didn't spread easily between people.
Para que haya una pandemia de verdad, necesitas un virus que mate y que también se propague de persona a persona con facilidad.
For a real pandemic you need a virus that kills and also spreads from person to person easily.
El H5N1 hasta ahora no ha conseguido las dos cosas al mismo tiempo.
H5N1 so far hasn't managed both at the same time.
That 'so far' is doing a lot of work in that sentence, Octavio.
Sí, lo hace.
Yes, it does.
Y eso es precisamente lo que ha cambiado desde 2020.
And that's precisely what has changed since 2020.
Lo que empezó como un brote grave en aves de corral en Europa y Asia se ha convertido en algo mucho más difícil de controlar.
What started as a severe outbreak in poultry in Europe and Asia has become something much harder to contain.
El virus mutó y comenzó a infectar mamíferos, incluyendo vacas lecheras en Estados Unidos, osos polares en el Ártico, leones marinos en América del Sur.
The virus mutated and started infecting mammals, including dairy cattle in the United States, polar bears in the Arctic, sea lions in South America.
The cattle thing in the U.S.
was genuinely alarming.
There were months in 2024 where it felt like the story wasn't getting nearly the attention it warranted.
Dairy farms across something like thirty states.
Fue un momento muy revelador.
It was a very revealing moment.
Y lo que mostró fue que el virus ya no necesita las rutas migratorias tradicionales de las aves para moverse.
And what it showed was that the virus no longer needs traditional bird migration routes to move.
Puede viajar con el ganado, con los trabajadores agrícolas, con el comercio.
It can travel with livestock, with farm workers, with trade.
La biología del H5N1 es más flexible de lo que pensábamos hace veinte años.
The biology of H5N1 is more flexible than we thought twenty years ago.
Which brings us back to Australia.
Because the story there isn't just a bird in Western Australia.
It's what that bird represents geographically and symbolically.
Australia es un caso fascinante en términos de bioseguridad.
Australia is a fascinating case in terms of biosecurity.
El país tiene una de las legislaciones más estrictas del mundo para controlar lo que entra en su territorio.
The country has some of the strictest legislation in the world for controlling what enters its territory.
Es famoso por eso.
It's famous for that.
No puedes llegar a un aeropuerto australiano con una manzana sin declarar sin arriesgarte a una multa considerable.
You can't arrive at an Australian airport with an undeclared apple without risking a significant fine.
I went through Sydney customs once carrying a cheese that I'd completely forgotten about in my bag.
The look on that officer's face.
Like I'd tried to smuggle in a small explosive.
Exactamente esa es la cultura.
That's exactly the culture.
Y tiene una lógica histórica muy poderosa.
And it has a very powerful historical logic.
Australia evolucionó en aislamiento durante millones de años, lo que significa que su fauna y su ecosistema son extremadamente vulnerables a enfermedades y especies invasoras.
Australia evolved in isolation for millions of years, which means its fauna and ecosystem are extremely vulnerable to invasive diseases and species.
Los australianos aprendieron eso a un costo enorme: el conejo europeo casi destruyó el campo australiano en el siglo XIX.
Australians learned that at an enormous cost: the European rabbit almost destroyed the Australian countryside in the nineteenth century.
And yet.
A wild seabird.
That's the thing about migratory birds.
You cannot put a seabird through customs.
Eso es fundamental.
That's fundamental.
Las aves migratorias son uno de los vectores principales de este virus, y no reconocen fronteras.
Migratory birds are one of the main vectors for this virus, and they don't recognize borders.
Muchas especies vuelan desde Asia o el Pacífico norte hasta Australia cada año siguiendo rutas migratorias que llevan existiendo miles de años.
Many species fly from Asia or the northern Pacific to Australia every year following migration routes that have existed for thousands of years.
No hay legislación que pueda cambiar eso.
No legislation can change that.
So the detection itself.
Is it the virus arriving, or is it the detection infrastructure getting better?
Because there's a version of this story where Australia's biosecurity worked perfectly.
They found it.
Fast.
Es una distinción muy importante que estás haciendo.
That's a very important distinction you're making.
Y la respuesta honesta es que probablemente es las dos cosas.
And the honest answer is that it's probably both.
La vigilancia epidemiológica ha mejorado muchísimo desde la pandemia de COVID.
Epidemiological surveillance has improved enormously since the COVID pandemic.
Hay más recursos, más laboratorios, más voluntad política para invertir en detección temprana.
There are more resources, more laboratories, more political will to invest in early detection.
Pero también hay más virus en circulación.
But there's also more virus in circulation.
Let me push on something.
The WHO and national health agencies have been warning about H5N1 becoming the next pandemic threat for years.
And yet every time there's a development, it feels like the public doesn't quite register it.
Is that a communication failure, or is it that the public has heard wolf too many times?
Las dos cosas, pero sobre todo la segunda.
Both things, but mainly the second.
Hay una fatiga real después del COVID.
There's real fatigue after COVID.
La gente escuchó durante años que debía preocuparse por los virus, que debía cambiar su comportamiento, que el mundo nunca volvería a ser igual.
People heard for years that they should worry about viruses, that they should change their behavior, that the world would never be the same.
Y luego, en cierta manera, volvió a ser casi igual.
And then, in a certain way, it mostly went back to being the same.
Eso crea una desconfianza profunda hacia los mensajes de alarma sanitaria.
That creates deep distrust toward public health warning messages.
There's a term epidemiologists use.
Preparedness fatigue.
And it's a genuine threat to the systems that are supposed to protect us, because those systems need political support, public engagement, and funding.
Y el problema con el H5N1 es que es un virus que tiene tiempo.
And the problem with H5N1 is that it's a virus with time on its side.
No tiene prisa.
It's in no hurry.
Lleva décadas circulando, adaptándose, encontrando nuevos huéspedes.
It's been circulating for decades, adapting, finding new hosts.
Cada vez que infecta a un mamífero en lugar de a un ave, tiene una nueva oportunidad de adquirir mutaciones que podrían facilitar la transmisión entre personas.
Every time it infects a mammal instead of a bird, it gets a new opportunity to acquire mutations that could make transmission between people easier.
When you put it that way, it almost sounds patient.
Which is a terrifying way to think about a pathogen.
La evolución viral no es consciente, claro.
Viral evolution isn't conscious, of course.
Pero el efecto es similar.
But the effect is similar.
El virus que tengamos que temer no va a ser el mismo que tenemos hoy.
The virus we'll have to fear won't be the same one we have today.
Va a ser una versión futura que haya encontrado la combinación correcta de mutaciones.
It'll be a future version that has found the right combination of mutations.
Y cuantos más huéspedes tenga, cuantos más continentes ocupe, más oportunidades tiene de encontrar esa combinación.
And the more hosts it has, the more continents it occupies, the more opportunities it has to find that combination.
Australia also has something other continents don't.
Its bird life is extraordinary, and a huge proportion of its species are found nowhere else on earth.
What does H5N1 arriving mean for those birds?
Es una pregunta que los biólogos australianos llevan tiempo haciendo con mucha angustia.
It's a question Australian biologists have been asking for some time with great anxiety.
Lo que ocurrió en Europa fue devastador para ciertas especies de aves acuáticas y costeras.
What happened in Europe was devastating for certain species of waterfowl and coastal birds.
En el Mar Caspio y en las costas del Atlántico europeo murieron millones de aves, incluyendo especies que ya estaban en peligro.
Millions of birds died around the Caspian Sea and on European Atlantic coasts, including species that were already endangered.
En Australia, el riesgo es que el virus llegue a poblaciones de aves que nunca han tenido contacto con él y que no tienen ninguna inmunidad.
In Australia, the risk is that the virus reaches bird populations that have never been exposed to it and have no immunity whatsoever.
There's a conservation dimension here that I think gets buried under the pandemic conversation.
We're so focused on the human risk, which is completely legitimate, that we don't talk enough about the ecological damage H5N1 has already caused.
Tienes razón.
You're right.
En Europa y América del Norte el impacto en las aves silvestres ha sido enorme.
In Europe and North America the impact on wild birds has been enormous.
Hay estudios que hablan de pérdidas de hasta el noventa por ciento de la población en algunas colonias de aves marinas.
There are studies that talk about losses of up to ninety percent of the population in some seabird colonies.
Eso tiene consecuencias en toda la cadena ecológica: en los peces, en los ecosistemas costeros, en los ciclos de nutrientes.
That has consequences throughout the entire ecological chain: in fish, in coastal ecosystems, in nutrient cycles.
Un virus que afecta a las aves afecta a todo.
A virus that affects birds affects everything.
Let me bring this back to something practical.
What should Australia actually be doing right now, and how does this change the calculus for other countries watching?
Lo primero es vigilancia intensiva, que parece que ya están haciendo.
The first thing is intensive surveillance, which it seems they're already doing.
Necesitan muestrear aves en diferentes regiones para saber si esto es un caso aislado o si el virus ya está más extendido de lo que parece.
They need to sample birds in different regions to find out if this is an isolated case or if the virus is already more widespread than it appears.
Lo segundo es proteger las granjas de aves de corral, que son un vector crítico porque allí el virus puede replicarse en grandes cantidades y aumentar el riesgo de mutaciones.
The second is protecting poultry farms, which are a critical vector because there the virus can replicate in large quantities and increase the risk of mutations.
And vaccines.
There are H5N1 vaccines in development and some already stockpiled.
That part of the preparedness infrastructure is actually in better shape than it was before COVID, because mRNA technology changed what's possible.
Sí, eso es un punto real de esperanza.
Yes, that's a genuine point of hope.
La plataforma de ARNm que se desarrolló para el COVID ha demostrado que se pueden crear vacunas muy rápidamente una vez que se identifica la cepa que hay que combatir.
The mRNA platform developed for COVID has shown that vaccines can be created very quickly once the strain to be fought is identified.
Si el H5N1 mutara de una forma que lo hiciera transmisible entre personas, tendríamos mucho más capacidad de respuesta que en 2020.
If H5N1 were to mutate in a way that made it transmissible between people, we'd have far more response capacity than in 2020.
El problema es el tiempo entre esa mutación y el momento en que la vacuna está lista y distribuida.
The problem is the time between that mutation and the moment when the vaccine is ready and distributed.
Weeks to months, depending on distribution systems.
And distribution is still wildly unequal globally.
We learned that, painfully, with COVID.
Esa es la lección que muchos países prefieren no recordar.
That's the lesson many countries prefer not to remember.
Durante el COVID, los países ricos acapararon vacunas mientras el mundo en desarrollo esperaba.
During COVID, rich countries hoarded vaccines while the developing world waited.
Si llega una pandemia de H5N1, ese mismo patrón podría repetirse.
If an H5N1 pandemic arrives, that same pattern could repeat itself.
Y mientras el mundo en desarrollo no esté protegido, el virus sigue teniendo espacio para circular y mutar.
And as long as the developing world isn't protected, the virus keeps having space to circulate and mutate.
There's a cruel irony in that.
The failure to vaccinate everyone is itself a risk to everyone.
The virus doesn't care about your national vaccination rate if your neighbors aren't covered.
Y eso es algo que los epidemiólogos repiten constantemente, pero que es muy difícil de traducir en política real.
And that's something epidemiologists repeat constantly, but which is very difficult to translate into real policy.
Porque los políticos responden ante sus propios votantes, no ante el mundo.
Because politicians answer to their own voters, not to the world.
Convencer a un gobierno de que invierta en la salud pública de otro país requiere un argumento de interés propio que a veces es difícil de articular de forma clara.
Convincing a government to invest in the public health of another country requires a self-interest argument that is sometimes hard to articulate clearly.
Alright.
So where does this leave us?
A single seabird in Western Australia, H5N1 now on every continent, and a global preparedness system that is better than it was but still full of holes.
Diría que estamos en un momento que los científicos llamarían de alta vigilancia.
I'd say we're in a moment that scientists would call high vigilance.
El virus no es todavía una amenaza pandémica inminente para los humanos, pero está acumulando las condiciones que podrían hacer que lo sea.
The virus is not yet an imminent pandemic threat to humans, but it is accumulating the conditions that could make it one.
Cada nuevo huésped mamífero, cada nuevo continente, cada nuevo brote en granjas es una pieza más en un rompecabezas que nadie quiere ver terminado.
Each new mammalian host, each new continent, each new farm outbreak is another piece in a puzzle nobody wants to see completed.
That image is going to stay with me.
A puzzle nobody wants completed.
Actually, speaking of images that stay with you, there was something you said earlier that I want to go back to.
You used the phrase 'lleva décadas circulando.' I've been hearing 'llevar' used that way a lot and I don't think I fully understand what it's doing.
Ah, buena pregunta.
Ah, good question.
'Llevar' con un gerundio es una construcción muy española para describir algo que empezó en el pasado y que todavía continúa.
'Llevar' with a gerund is a very Spanish construction for describing something that started in the past and is still continuing.
'Lleva décadas circulando' significa que el virus lleva circulando desde hace décadas y sigue haciéndolo ahora mismo.
'Lleva décadas circulando' means the virus has been circulating for decades and is still doing so right now.
No es simplemente 'ha circulado durante décadas', que en inglés sería más una descripción histórica.
It's not simply 'ha circulado durante décadas', which in English would be more of a historical description.
So it's the present continuous dimension.
The ongoing-ness of it.
In English we'd say 'it's been circulating for decades' with that 'has been' construction.
The Spanish collapses that into 'llevar' plus the gerund.
Exacto.
Exactly.
Y puedes usarlo para tiempos muy diferentes.
And you can use it for very different spans of time.
'Lleva tres horas esperando', 'lleva años viviendo aquí', 'lleva semanas sin dormir bien'.
'He's been waiting for three hours', 'she's been living here for years', 'he's been sleeping badly for weeks'.
Siempre comunica una duración que empezó antes y que todavía no ha terminado.
It always communicates a duration that started before and hasn't ended yet.
Es una de esas construcciones que suena muy natural en español pero que no tiene una equivalencia directa en inglés.
It's one of those constructions that sounds very natural in Spanish but has no direct equivalent in English.
So I could say 'llevo ocho años aprendiendo español' and sound like I know what I'm doing.
Podrías decirlo perfectamente.
You could say it perfectly.
Aunque el hecho de que todavía no lo domines después de ocho años es un tema para otro episodio.
Although the fact that you still don't master it after eight years is a topic for another episode.