NCDC launches 21-day Ebola watch for exposed travellers

The Nigeria Centre for Disease Control and Prevention has placed travellers arriving from countries experiencing Ebola outbreaks under intensified surveillance, directing health workers nationwide to closely monitor individuals who develop symptoms within 21 days of travel.

The agency, in updated surveillance guidelines issued to health facilities and disease surveillance officers, said any person who develops a sudden fever and other symptoms associated with Ebola within 21 days of travelling to affected countries should be treated as a suspected case and immediately investigated.

The directive comes as Nigeria remains on heightened alert over ongoing Ebola outbreaks in parts of Africa, particularly countries such as the Democratic Republic of Congo and Uganda, where health authorities have continued efforts to contain periodic outbreaks of the deadly viral disease.

According to the NCDC guidelines, any person with a sudden onset of fever and at least three symptoms, including headaches, lethargy, loss of appetite, muscle or joint pain, stomach pain, difficulty swallowing, vomiting, difficulty breathing, diarrhoea or hiccups, who has travelled to a country reporting suspected or confirmed Ebola cases within the previous 21 days, should be considered a suspected Ebola case.

The guidelines noted that the 21-day period is critical because it corresponds with the known incubation period of the Ebola virus, during which an exposed person may begin to develop symptoms.

Beyond international travel, the NCDC said individuals exposed to wildlife or bushmeat within the previous 21 days and who develop persistent fever that does not respond to routine treatment should also be regarded as suspected cases.

The agency explained that exposure to sick or dead animals, bushmeat, or animal body fluids remains a recognised pathway for transmission of Ebola from animals to humans.

According to the guidelines, healthcare workers should be particularly vigilant when evaluating patients with unexplained fever who have epidemiological links to confirmed cases or high-risk exposures.

The NCDC defined a probable case as “any suspected case with an epidemiological link to a confirmed case for whom laboratory confirmation could not be obtained.”

The agency added that confirmation of Ebola infection can only be made through laboratory testing.

“Laboratory confirmed cases must test positive for the virus antigen either through detection of virus RNA by reverse transcriptase-polymerase chain reaction (RT-PCR) or through detection of IgM antibodies directed against Ebola,” the guidelines stated.

As part of efforts to strengthen early detection, the NCDC also expanded surveillance at the community level, urging residents to report unusual illnesses and unexplained deaths promptly.

Under the agency’s community-based surveillance framework, any person with persistent fever that fails to respond to treatment, bleeding symptoms, bloody diarrhoea, blood in urine, or any sudden unexplained death should be reported immediately to health authorities.

“Any sudden or unexplained death should be considered a priority event for investigation,” the guidelines stated.

Public health experts say community reporting remains one of the most effective tools for detecting outbreaks before they spread widely.

The renewed emphasis on the 21-day monitoring period reflects lessons learned from previous Ebola outbreaks across Africa, where delays in identifying exposed individuals often contributed to the spread of the disease.

Ebola Virus Disease is a severe and often fatal illness caused by viruses of the genus Ebolavirus.

The disease is transmitted through direct contact with the blood, body fluids, organs or tissues of infected persons and contaminated materials.

Symptoms typically begin with sudden fever, weakness, muscle pain and headaches before progressing to vomiting, diarrhoea and, in severe cases, internal and external bleeding.

The World Health Organisation estimates that Ebola outbreaks have recorded case fatality rates ranging from about 25 per cent to 90 per cent, depending on the virus strain and access to medical care.

Nigeria’s public health authorities remain particularly sensitive to Ebola threats following the country’s widely acclaimed response to the 2014 outbreak.

The outbreak began after an infected Liberian-American traveller arrived in Lagos and resulted in 20 confirmed and probable cases and eight deaths.

Through aggressive contact tracing, rapid isolation of cases and coordinated public health interventions, Nigeria successfully interrupted transmission and was declared Ebola-free by the WHO less than three months later.

Health authorities say early reporting, rapid investigation of suspected cases and strict adherence to infection prevention measures remain critical to protecting Nigeria from another Ebola outbreak.