ABUJA/DAKAR, Oct 22 – Nigeria’s confirmation of an Ebola case after a 13-day delay in testing has heightened concerns about the spread of a major outbreak across Africa, with public health officials warning that the virus could reach countries previously considered at lower risk. The case, detected in the capital, Abuja, has raised questions about early diagnosis, hospital preparedness and the ability of authorities to identify everyone who may have been exposed.
The outbreak, which was first detected in the Democratic Republic of Congo in May, has since involved Uganda and Kenya before reaching Nigeria, extending its known geographic reach across approximately 3,000 kilometres. The epidemic is the second-largest Ebola outbreak on record, and the latest development has increased pressure on health agencies to strengthen surveillance and coordinate their response across national borders.
Nigeria’s first confirmed Ebola case in more than a decade involves the Ugandan-born wife of a Swiss diplomat. According to Dr Jean Kaseya, director-general of the Africa Centres for Disease Control and Prevention (Africa CDC), the woman arrived in Abuja on October 3 after spending two weeks on holiday in Uganda. She developed symptoms three days later but was not tested for Ebola until October 19.
The delay is particularly concerning because Abuja is a major international travel hub, with connections that could complicate efforts to determine whether the infection has spread beyond the initial patient. Before the disease was identified, the woman sought medical attention at several healthcare facilities, initially believing that she might have malaria.
Delayed Diagnosis Complicates Contact Tracing
Kaseya said the case has changed the assessment of which countries could face a risk from the outbreak. Nigeria had not previously been included on the list of countries considered at risk, but the confirmation of an infection has forced health officials to reconsider their approach.
He warned that the risk assessment would need to be revised and that countries in both northern and southern Africa could also face potential exposure. His comments reflected concern that the virus may travel farther than initially anticipated if infected people are not identified promptly.
The delay in diagnosis presents a significant challenge for contact tracing, a central part of efforts to contain Ebola. Health officials must identify people who may have been exposed to the patient while she was experiencing symptoms, including relatives, friends, medical personnel and others who had close contact with her.
Ebola is transmitted through direct contact with the bodily fluids of an infected person who is showing symptoms. The risk of further transmission therefore depends partly on how quickly suspected cases are recognised, isolated and investigated.
Kaseya said Nigerian authorities had identified 44 contacts connected to the patient, but the number was expected to increase as investigators reconstructed her movements and interactions during the period before diagnosis.
He described the investigation as particularly difficult because the woman had spent nearly two weeks without an Ebola test and had visited multiple healthcare facilities. Each additional contact could require assessment, monitoring and, where necessary, further testing to determine whether transmission had occurred.
The outbreak is caused by the Bundibugyo species of Ebola virus, for which there is currently no approved vaccine or specific treatment. The disease has infected more than 9,500 people and killed over 4,600 in the Democratic Republic of Congo alone, according to the figures cited by public health officials.
The absence of a vaccine or specific treatment for this strain makes early identification, infection prevention and close monitoring of exposed individuals especially important. Health facilities must also take precautions to prevent possible transmission among patients and healthcare workers.
Nigeria has pointed to its experience managing an Ebola case during the West African epidemic of 2014 to 2016 as evidence that it has the capacity to respond. Authorities have expressed confidence in the country’s preparedness, drawing on lessons from the earlier outbreak.
However, Dr Ayoade Alakija, a Nigerian physician and co-chair of a G7 committee focused on investment in global health, said the circumstances surrounding the current case differ significantly from those of Nigeria’s previous experience.
During the earlier epidemic, the first patient to bring Ebola into Nigeria had travelled by air from Liberia and was hospitalised immediately upon arrival. That rapid intervention helped limit opportunities for further exposure.
Alakija said the current case presents a different challenge because the woman remained undiagnosed while seeking care at multiple facilities. The difference highlights the importance of recognising symptoms quickly, particularly when patients have recently travelled to areas affected by an outbreak.
Questions Over Uganda Link Raise Regional Concerns
The circumstances surrounding the woman’s infection remain under investigation, with officials in Nigeria and Uganda presenting different accounts of her travel history.
Ugandan authorities have said the woman travelled to eastern Democratic Republic of Congo before passing through Uganda on her way to Nigeria. Nigerian officials, however, have said they have not confirmed that she visited Congo.
Nigeria’s Health Minister Muhammad Ali Pate told state television on Tuesday that investigators had no confirmed evidence of travel to the Democratic Republic of Congo. On the information available to Nigerian authorities, he said, Uganda was considered the likely place where the woman contracted the virus.
Kaseya said the Africa CDC was seeking clarification from both countries and from the patient herself. Establishing where the infection occurred is important for determining how the virus reached Nigeria and whether additional gaps exist in regional disease surveillance.
Marion Koopmans, a Dutch virologist who serves on the World Health Organization’s Ebola emergency committee, said the woman’s travel history could have significant implications for the wider response.
If she had travelled to eastern Congo, her case would raise further concerns about the effectiveness of health screening at international borders and airports. Screening measures are intended to identify people who may have been exposed to the virus, although detecting infections can be difficult when symptoms develop after travel or when an illness is initially mistaken for another disease.
If the woman had not visited Congo, investigators would need to establish how she became infected in Uganda, where authorities had previously reported progress in controlling the outbreak.
Uganda recorded 20 cases in May and June, most of them linked to infections imported from the Democratic Republic of Congo. The World Health Organization declared Uganda free of Ebola in August after the outbreak there was brought under control.
The latest case in Nigeria has raised questions about whether transmission continued undetected or whether the infection followed a route that investigators have yet to establish. Resolving those questions will be essential to identifying potential chains of transmission and deciding where additional surveillance is needed.
Koopmans said the case demonstrated that the epidemic was not over, regardless of whether the woman had travelled to Congo. Her assessment underlines the difficulties of declaring an outbreak contained when people and goods continue to move between countries and infections may go unrecognised.
For Nigerian health authorities, the immediate priorities include expanding contact tracing, monitoring people who may have been exposed and investigating the patient’s movements before she was tested. The response will also depend on cooperation among national health agencies and international organisations, particularly as officials reassess which countries could face further exposure.
The case has renewed attention on the need for healthcare workers to consider Ebola when evaluating patients with compatible symptoms and relevant travel histories. Early testing and isolation can reduce opportunities for transmission, while delays can widen the number of people who need to be traced.
As investigators work to establish the origin of Nigeria’s infection, the wider outbreak continues to test public health surveillance across the continent. The findings from the current investigation could help determine whether the case represents a limited introduction into Nigeria or evidence of a more extensive pattern of transmission that has yet to be detected.