I am a conservation biologist who studies emerging infectious diseases. When people ask me what I think the next pandemic will be I often say that we are in the midst of one – it’s just afflicting a great many species more than ours.

I am referring to the highly pathogenic strain of avian influenza H5N1 (HPAI H5N1), otherwise known as bird flu, which has killed millions of birds and unknown numbers of mammals, particularly during the past three years.

This is the strain that emerged in domestic geese in China in 1997 and quickly jumped to humans in south-east Asia with a mortality rate of around 40-50%. My research group encountered the virus when it killed a mammal, an endangered Owston’s palm civet, in a captive breeding programme in Cuc Phuong National Park Vietnam in 2005.

How these animals caught bird flu was never confirmed. Their diet is mainly earthworms, so they had not been infected by eating diseased poultry like many captive tigers in the region.

This discovery prompted us to collate all confirmed reports of fatal infection with bird flu to assess just how broad a threat to wildlife this virus might pose.

This is how a newly discovered virus in Chinese poultry came to threaten so much of the world’s biodiversity.

The first signs

Until December 2005, most confirmed infections had been found in a few zoos and rescue centres in Thailand and Cambodia. Our analysis in 2006 showed that nearly half (48%) of all the different groups of birds (known to taxonomists as “orders”) contained a species in which a fatal infection of bird flu had been reported. These 13 orders comprised 84% of all bird species.

We reasoned 20 years ago that the strains of H5N1 circulating were probably highly pathogenic to all bird orders. We also showed that the list of confirmed infected species included those that were globally threatened and that important habitats, such as Vietnam’s Mekong delta, lay close to reported poultry outbreaks.

Mammals known to be susceptible to bird flu during the early 2000s included primates, rodents, pigs and rabbits. Large carnivores such as Bengal tigers and clouded leopards were reported to have been killed, as well as domestic cats.

Our 2006 paper showed the ease with which this virus crossed species barriers and suggested it might one day produce a pandemic-scale threat to global biodiversity.

Unfortunately, our warnings were correct.

A roving sickness

Two decades on, bird flu is killing species from the high Arctic to mainland Antarctica.

In the past couple of years, bird flu has spread rapidly across Europe and infiltrated North and South America, killing millions of poultry and a variety of bird and mammal species. A recent paper found that 26 countries have reported at least 48 mammal species that have died from the virus since 2020, when the latest increase in reported infections started.

Not even the ocean is safe. Since 2020, 13 species of aquatic mammal have succumbed, including American sea lions, porpoises and dolphins, often dying in their thousands in South America. A wide range of scavenging and predatory mammals that live on land are now also confirmed to be susceptible, including mountain lions, lynx, brown, black and polar bears.

The UK alone has lost over 75% of its great skuas and seen a 25% decline in northern gannets. Recent declines in sandwich terns (35%) and common terns (42%) were also largely driven by the virus.

Scientists haven’t managed to completely sequence the virus in all affected species. Research and continuous surveillance could tell us how adaptable it ultimately becomes, and whether it can jump to even more species. We know it can already infect humans – one or more genetic mutations may make it more infectious.

At the crossroads

Between January 1 2003 and December 21 2023, 882 cases of human infection with the H5N1 virus were reported from 23 countries, of which 461 (52%) were fatal.

Of these fatal cases, more than half were in Vietnam, China, Cambodia and Laos. Poultry-to-human infections were first recorded in Cambodia in December 2003. Intermittent cases were reported until 2014, followed by a gap until 2023, yielding 41 deaths from 64 cases. The subtype of H5N1 virus responsible has been detected in poultry in Cambodia since 2014. In the early 2000s, the H5N1 virus circulating had a high human mortality rate, so it is worrying that we are now starting to see people dying after contact with poultry again.

It’s not just H5 subtypes of bird flu that concern humans. The H10N1 virus was originally isolated from wild birds in South Korea, but has also been reported in samples from China and Mongolia.

Recent research found that these particular virus subtypes may be able to jump to humans after they were found to be pathogenic in laboratory mice and ferrets. The first person who was confirmed to be infected with H10N5 died in China on January 27 2024, but this patient was also suffering from seasonal flu (H3N2). They had been exposed to live poultry which also tested positive for H10N5.

Species already threatened with extinction are among those which have died due to bird flu in the past three years. The first deaths from the virus in mainland Antarctica have just been confirmed in skuas, highlighting a looming threat to penguin colonies whose eggs and chicks skuas prey on. Humboldt penguins have already been killed by the virus in Chile.

How can we stem this tsunami of H5N1 and other avian influenzas? Completely overhaul poultry production on a global scale. Make farms self-sufficient in rearing eggs and chicks instead of exporting them internationally. The trend towards megafarms containing over a million birds must be stopped in its tracks.

To prevent the worst outcomes for this virus, we must revisit its primary source: the incubator of intensive poultry farms.

Diana Bell does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

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While going on a cruise once meant disconnecting from the world when between ports because any WiFi available aboard was glitchy and expensive, advances in technology over the last decade have enabled millions to not only stay in touch with home but even work remotely.

With such remote workers and digital nomads in mind, Virgin Voyages has designed a monthly pass that gives those who want to work from the seas a WFH setup on its Scarlet Lady ship — while the latter acronym usually means "work from home," the cruise line is advertising as "work from the helm.”

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"Inspired by Richard Branson's belief and track record that brilliant work is best paired with a hearty dose of fun, we're welcoming Sailors on board Scarlet Lady for a full month to help them achieve that perfect work-life balance," Virgin Voyages said in announcing its new promotion. "Take a vacation away from your monotonous work-from-home set up (sorry, but…not sorry) and start taking calls from your private balcony overlooking the Mediterranean sea."

This is how much it'll cost you to work from a cruise ship for a month

While the single most important feature for successful work at sea — WiFi — is already available for free on Virgin cruises, the new Scarlet Summer Season Pass includes a faster connection, a $10 daily coffee credit, access to a private rooftop, and other member-only areas as well as wash and fold laundry service that Virgin advertises as a perk that will allow one to concentrate on work

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The pass starts at $9,990 for a two-guest cabin and is available for four monthlong cruises departing in June, July, August, and September — each departs from ports such as Barcelona, Marseille, and Palma de Mallorca and spends four weeks touring around the Mediterranean.

Longer cruises are becoming more common, here's why

The new pass is essentially a version of an upgraded cruise package with additional perks but is specifically tailored to those who plan on working from the ship as an opportunity to market to them.

"Stay connected to your work with the fastest at-sea internet in the biz when you want and log-off to let the exquisite landscape of the Mediterranean inspire you when you need," reads the promotional material for the pass.

Amid the rise of remote work post-pandemic, cruise lines have been seeing growing interest in longer journeys in which many of the passengers not just vacation in the traditional sense but work from a mobile office.

In 2023, Turkish cruise line operator Miray even started selling cabins on a three-year tour around the world but the endeavor hit the rocks after one of the engineers declared the MV Gemini ship the company planned to use for the journey "unseaworthy" and the cruise ship line dealt with a PR scandal that ultimately sank the project before it could take off.

While three years at sea would have set a record as the longest cruise journey on the market, companies such as Royal Caribbean  (RCL) (both with its namesake brand and its Celebrity Cruises line) have been offering increasingly long cruises that serve as many people’s temporary homes and cross through multiple continents.

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