After going through my columns on Lassa fever over the last decade, I was forced to accept the glaring truth that there is also a morbid pattern to the outbreak, just like in other climate-induced epidemics like cholera and meningitis. And here lies the pain. If the outbreak is recurring, why are we not able to master it? Nations around the world are daily devising ways to nip epidemics in the bud. What makes us a human civilisation is that when nature deals us a bad hand, we do not curl up and die - we get up and win.
Lassa fever is preventable because it has a visible source. The rodent that carries the virus is here with us; all we need to do is think. We just have to devise ways to either do away with the rodents or ensure they never breed in our immediate environment. Better yet, we create means of putting a boundary between the vectors' ecosystem and our human abodes, especially when we identify the time of the year and the weather that aids their interface with the human ecosystem.
Sadly, we have allowed it to fester, and it is getting worse by the day. The report for this year's outbreak shows that the case fatality rate stands at 25.1 per cent, significantly higher than the 18.7 per cent recorded during the same period in 2025.
Since its discovery over five decades ago, Lassa fever has evolved from a mysterious rural illness into one of Nigeria's most persistent public health threats. Its history is not just a medical timeline - it is a story of missed opportunities, slow institutional learning, and recurring national vulnerability. It was first identified in 1969 in Lassa town, in present-day Borno State, when a missionary nurse fell ill with a strange hemorrhagic disease. By 1970, scientists had isolated the virus and described its clinical features. This period marked the birth of awareness, but little was done structurally to prevent future outbreaks.
So, it began a silent spread across Nigeria and other West African countries. Over three decades, surveillance was weak, public awareness was low, and the disease remained largely rural and underreported. Occasional hospital outbreaks occurred, especially due to poor infection control, but sadly, the disease did not yet command national attention. This error of treating it as a localised anomaly and not a national threat caused a national reemergence as we entered the millennium. By the early 2000s, outbreaks became more frequent and geographically widespread. The disease was evolving faster than the country's preparedness. Lassa fever transitioned from a sporadic crisis to a seasonal epidemic pattern, typically peaking between October and May.
However, rising case numbers revealed a paradox: better detection was exposing a larger underlying problem. By 2023, Nigeria recorded thousands of suspected cases and hundreds of confirmed infections within just a few months. Meanwhile, it was driven by poverty and a poor environment. Climate and urban pressures are increasing the risk, and sadly, Nigeria is now managing Lassa fever but not reducing its root causes. Progress has been simply reactive, not preventive.
Anyway, the purpose of today's piece is to show a subtle dynamic in outbreak patterns and what we can take out of it. Roughly 85 per cent of reported cases are concentrated in just five states. On the surface, this may appear to be a narrow epidemiological issue. In reality, it is a profound national warning - one that reveals deep structural weaknesses in governance, healthcare delivery, environmental management, and socio-economic planning.
In my mind, if we can interrogate the tapestry of this diabolical pattern with a solution-minded segregation of datasets, there is every chance that we shall develop a more durable national response system than the knee-jerk intervention mechanism we have been deploying before now. The states - Edo, Ondo, Ebonyi, Bauchi, and Taraba - are not merely locations on a map. They are a mirror reflecting Nigeria's uneven development and fragmented public health architecture.
Take Edo State, for instance. With the Irrua Specialist Teaching Hospital serving as a leading treatment and research hub, Edo consistently reports high case numbers. But this is not necessarily because it is the most infected; rather, it is the most visible. Its strength lies in detection, diagnosis, and reporting. In contrast, other states may be battling silent outbreaks, hidden by weak surveillance systems. The implication is clear: in Nigeria, data often reflects capacity - not just reality. Strengthening institutions like the Nigeria Centre for Disease Control must therefore go beyond Abuja; it must reach the grassroots.
Ondo State tells a different story, one rooted in ecology. Its agrarian communities, dense vegetation, and close human interaction with rodent populations make it a natural hotspot. Here, Lassa fever is not just a medical issue; it is an environmental one. Food drying practices, poor housing, and inadequate waste management all create a perfect breeding ground for the disease. This underscores a critical point: Nigeria cannot treat Lassa fever effectively without integrating environmental and agricultural policies into public health strategy.
In Ebonyi State, the challenge is access. Many patients arrive late at health facilities, often when complications have advanced. The result is a higher fatality rate. This is not merely a failure of medicine; it is a failure of systems. When primary healthcare is weak, diseases that are treatable become deadly. The availability of antivirals like Ribavirin means little if patients cannot access care in time.
Bauchi State, on the other hand, highlights the danger of underreporting. With vast rural populations and limited surveillance infrastructure, many cases go undetected. This creates a false sense of security while the disease quietly spreads. It is a stark reminder that what is not reported is not necessarily absent.
Then there is Taraba State, where climate change and human mobility intersect. Shifting rainfall patterns, deforestation, and cross-border movements are altering disease dynamics. As communities expand into previously undisturbed habitats, they increase contact with disease vectors. Taraba is not just a hotspot; it is a glimpse into Nigeria's future if climate adaptation is not taken seriously.
What binds these five states together is not just geography, but vulnerability. They represent zones where poverty, weak infrastructure, and environmental pressures converge. The concentration of Lassa fever cases in these areas is therefore not accidental - it is diagnostic. Yet, Nigeria's response has largely remained reactive. Each outbreak season triggers emergency meetings, press briefings, and short-term interventions. When the numbers decline, so does the urgency. This cycle of panic and neglect must end.
The lesson is simple but urgent: Nigeria must move from generalised response to precision public health. Resources should be strategically concentrated in high-risk zones, with permanent infrastructure rather than temporary measures. Regional treatment centres must be established beyond Edo, surveillance systems must be standardised nationwide, and community-level education must be sustained, not seasonal. More importantly, Lassa fever must be reframed as a development issue. It is about housing quality, waste management, food systems, education, and poverty. It is about how Nigerians live, not just how they fall ill.
There is also a political dimension that cannot be ignored. Public health is governance. When certain states consistently bear the burden of disease, it raises questions about equity, resource allocation, and federal responsibility. Addressing Lassa fever effectively will require political will that transcends rhetoric.
Ultimately, the "five-state concentration" is not just a statistic - it is a map of neglect and an opportunity for reform. If Nigeria can decisively fix the structural challenges in these hotspot states and use them as case studies for the remaining thirty-two subnational administrations, it can drastically reduce the national burden of Lassa fever. The choice before us is clear: continue reacting to outbreaks or confront the underlying conditions that make them inevitable.