Pathogens don't recognise borders, and neither should our response
In August 2024, the World Health Organisation declared mpox a public health emergency of international concern, as a deadlier strain of the virus swept through thirteen African nations, killing hundreds and defying the containment strategies that had managed earlier variants. The Democratic Republic of Congo bore the heaviest burden, with children dying at a rate of one in ten. This declaration was not merely a bureaucratic threshold crossed — it was a reckoning with the cost of uneven global vigilance, and a reminder that diseases nurtured in neglect do not stay contained by geography.
- A new mpox strain, clade 1a, is killing adults at twice the rate of previous variants and children at one in ten — numbers that have overwhelmed health systems across central and east Africa.
- The virus has crossed into thirteen countries within months, spreading not only through sexual contact but through touch in schools and workplaces, making traditional containment measures far harder to enforce.
- Goma, a major eastern DRC city with direct international flights to Europe, has already reported cases, raising credible fears that the outbreak could seed itself far beyond the African continent.
- The WHO's emergency declaration is a formal demand for urgency — pushing governments to share vaccines, mobilise resources, and coordinate before the situation outpaces any possible response.
- Vaccines and treatments exist but remain largely inaccessible in the most affected regions, exposing a structural failure that experts warn has allowed mpox to fester in West and Central Africa for decades without adequate global attention.
On a Wednesday in August, the World Health Organisation declared mpox a public health emergency of international concern — a designation reserved for moments when a disease threatens to outrun the world's ability to respond. The trigger was a deadlier variant sweeping central and east Africa with alarming speed, reaching thirteen countries in a matter of months and killing at rates nearly double those of the strain the world had previously learned to manage.
Since January 2024, the Democratic Republic of Congo alone had recorded more than 16,700 cases and over 500 deaths. The strain responsible, clade 1a, carried a fatality rate of around five percent in adults and ten percent in children. A newer variant, clade 1b, had already appeared in four countries with no prior mpox history, spreading through touch in schools and workplaces — a transmission pattern that made containment exponentially more difficult.
WHO Director-General Dr. Tedros Adhanom Ghebreyesus described the situation as multiple concurrent crises, each with distinct dynamics. Jean Kaseya of the Africa CDC called the emergency declaration a clarion call, warning that without aggressive action the disease could spiral beyond control. The concern was not limited to Africa. Scientists had traced clade 1b to Kamituga, a DRC mining town, and flagged its pandemic potential. Goma, with its international airport and direct flights to Europe, had already reported cases — a detail that focused minds in health ministries far from the outbreak's epicentre.
Experts assessed the risk of European transmission as small but real. The 2022 outbreak, when a different mpox strain reached over a hundred countries including the UK, had demonstrated how quickly the virus could travel. What made the current moment more troubling was the near-absence of vaccines and treatments in the most affected regions — resources that existed but had never been equitably distributed.
As Josie Golding of the Wellcome Foundation observed, mpox had circulated in West and Central African communities for decades, largely ignored until it arrived in Europe and North America in 2022. The current surge was, in part, the consequence of that neglect. The emergency declaration was designed to change the calculus — to make preparation a priority before the virus made the decision for everyone.
On a Wednesday in August, the World Health Organisation made a declaration that sent ripples through health ministries across the globe: mpox had been named a public health emergency of international concern. The announcement came after a deadlier variant of the virus swept across central and east Africa with alarming speed, reaching thirteen countries in a matter of months.
The numbers told a stark story. Since January 2024, the Democratic Republic of Congo had recorded more than 16,700 cases and over 500 deaths. The virus responsible—a strain called clade 1a—carried a fatality rate of roughly five percent in adults and ten percent in children, nearly double the three percent mortality of its predecessor. This was not the mpox the world had grown accustomed to managing. Scientists at the Africa Centres for Disease Control and Prevention had sounded the alarm as the outbreak accelerated, and their warnings proved prescient. Within weeks, the virus had crossed borders into Burundi, the Central African Republic, Kenya, Rwanda, Uganda, and nine other nations. In some places, like schools and workplaces, it was spreading through touch alone—a transmission pattern that made containment exponentially harder.
Dr. Tedros Adhanom Ghebreyesus, the WHO's director-general, explained the gravity of the situation with clinical precision. The organisation was not dealing with a single outbreak but rather multiple concurrent crises, each with different transmission patterns and different levels of risk. In the previous month alone, roughly ninety cases of a newer variant, clade 1b, had appeared in four countries that had never reported mpox before. The declaration, he said, was meant to push governments to act with urgency—to share vaccines, to mobilise resources, to prepare rather than react.
Jean Kaseya, head of the Africa CDC, was blunt about what the emergency designation meant. "This is not merely a formality," he said. "It is a clarion call to action." Without immediate, aggressive containment efforts, the disease could spiral beyond control. The concern extended beyond the continent. In April, scientists had identified the clade 1b strain in Kamituga, a small mining town in the DRC, and noted its potential for pandemic spread. Goma, a major city in the east, had already reported cases—and Goma had an international airport with regular direct flights to Europe. The virus did not recognise borders, as global health experts were quick to remind anyone listening.
The risk of international spread was real but not yet inevitable. Prof Marion Koopmans from the Pandemic and Disaster Management Centre assessed the chance of the virus reaching Europe as small, though possible. Others were more cautious. Trudie Lang, a professor of global health research at Oxford, noted that infectious individuals could board flights and transmit the disease elsewhere. The 2022 outbreak, when a different mpox strain had reached over one hundred countries including the UK, had shown how quickly the virus could travel.
What made this moment particularly urgent was the absence of adequate medical countermeasures in the affected regions. Vaccines and treatments existed but were not widely available in Congo or many other African nations. The global health system had learned lessons from 2022, but implementation remained uneven. Josie Golding of the Wellcome Foundation articulated the deeper problem: mpox had affected West and Central African communities for decades, yet the world had only paid attention during the 2022 outbreak in Europe and North America. The current surge demonstrated what happened when vigilance lapsed and resources flowed unevenly.
The symptoms of mpox—fever, respiratory distress, muscle aches, swollen lymph nodes, and eventually pus-filled lesions on the hands, feet, chest, mouth, or genitals—were unmistakable once they appeared. But early diagnosis remained difficult. The virus could masquerade as other illnesses. It could spread through a handshake or a classroom desk. It could kill a child at a rate of one in ten. The emergency declaration was meant to change the calculus, to make preparation a priority rather than an afterthought. Whether governments would respond with the speed and coordination the moment demanded remained to be seen.
Notable Quotes
This declaration is not merely a formality. It is a clarion call to action. We must be proactive and aggressive in our efforts to contain and eliminate this threat.— Jean Kaseya, Africa CDC head
We are not dealing with one outbreak of one clade – we are dealing with several outbreaks of different clades in different countries with different modes of transmission and different levels of risk.— Dr. Tedros Adhanom Ghebreyesus, WHO Director-General
The Hearth Conversation Another angle on the story
Why does the WHO's declaration matter if the virus is already spreading?
Because a formal emergency declaration unlocks resources and political will. It tells governments to stop waiting and start acting—to share vaccines, to coordinate surveillance, to prepare their health systems. Without it, the response stays fragmented and slow.
The fatality rate is higher in children. Why is that?
We don't know for certain yet. It could be that children's immune systems respond differently, or that they're exposed in different ways—through schools and workplaces rather than sexual contact. The virus is still being studied.
Goma has an international airport. How worried should Europe be?
Worried enough to prepare, not panicked. The virus can travel on a plane. But it's not airborne—it requires close contact. If someone infected boards a flight, they could transmit it, but the risk is manageable if systems are in place to detect and isolate cases quickly.
Why wasn't this treated as urgent before August?
Because it was happening in Africa, and the world's attention had moved on. The 2022 outbreak in Europe and North America got headlines and resources. This one was spreading in the DRC for months before anyone outside the region really noticed.
What does "clade" mean in practical terms?
It's a genetic variant—a slightly different version of the same virus. Clade 1a is deadlier and spreads differently than clade 2, which caused the 2022 outbreak. Understanding which variant you're dealing with changes how you respond to it.
If vaccines exist, why aren't they in Congo?
Supply chains, cost, and priority. Wealthy countries bought them first during the 2022 outbreak. Congo doesn't have the same purchasing power or distribution infrastructure. It's a problem of equity, not availability.