Why border closures won't stop the next Ebola outbreak
The current Bundibugyo outbreak shows that surveillance, isolation and community trust — not blanket travel bans — are what actually control Ebola.
When Ebola makes headlines, governments often face pressure to "close the borders." At first glance, the idea seems intuitive: if infected people cannot enter a country, the outbreak cannot spread.
Unfortunately, infectious disease epidemiology is rarely that simple.
A recent correspondence published in Nature Medicine argues that the current Bundibugyo Ebola outbreak in the Democratic Republic of the Congo (DRC) and Uganda demonstrates why strengthening core public health measures is far more effective than imposing blanket travel restrictions.
A different type of Ebola
Many people are unaware that "Ebola" is not a single virus. Several Ebola virus species exist, and the currently licensed vaccines were primarily developed against Zaire ebolavirus, the species responsible for the devastating West African epidemic between 2014 and 2016.
The current outbreak, however, is caused by Bundibugyo ebolavirus, for which no licensed vaccine or specific antiviral treatment is currently available.
This means that outbreak control depends largely on traditional public health interventions.
What actually works?
According to the authors, successful outbreak control relies on:
- Rapid identification of suspected cases
- Laboratory confirmation
- Prompt isolation of infected patients
- Strict infection prevention and control in healthcare settings
- Contact tracing and monitoring
- Community engagement and public trust
- Close collaboration between neighbouring countries
These measures have repeatedly proven capable of interrupting transmission, even in the absence of vaccines.
Why border closures rarely help
Border closures may appear decisive, but their real-world impact is often limited.
People frequently continue crossing borders through informal routes, particularly in regions where communities routinely move between neighbouring countries for work, trade or family. Blanket travel restrictions can also discourage individuals from seeking medical care, delay reporting of cases, disrupt humanitarian assistance and create substantial economic consequences.
Previous Ebola outbreaks have shown that early detection and rapid local response are generally far more effective than broad travel bans.
This does not mean that travel-related measures have no role. Exit screening, traveller information, risk-based recommendations and surveillance can all contribute to reducing international spread. However, these approaches are most effective when integrated into a broader public health response rather than replacing it.
What does this mean for travellers?
For most international travellers, the risk of acquiring Ebola remains very low.
Transmission requires direct contact with the blood or other body fluids of a symptomatic infected person (or contaminated materials), and does not occur through casual contact or through the air.
Travellers should:
- Stay informed about ongoing outbreaks.
- Follow official travel advice.
- Avoid contact with sick individuals or bodily fluids.
- Seek medical attention promptly if compatible symptoms develop after travel to an affected area.
Healthcare workers and humanitarian personnel working in outbreak settings face considerably higher risks and require specialised training and protective equipment.
Our perspective
The Bundibugyo outbreak is a reminder that despite remarkable advances in vaccines and therapeutics, epidemic control still depends on the fundamentals of public health.
Surveillance, laboratory capacity, infection prevention, community trust and international cooperation may lack the visibility of new vaccines, but they remain the cornerstone of outbreak response. Investing in these systems before emergencies occur is likely to save far more lives than reactive border closures once an outbreak is already underway.
Further reading
Ngongo N, Fallah MP, Dereje N, Boum Y, Kaseya J. Bundibugyo Ebola without vaccines or therapeutics: why public health fundamentals matter more than border closures. Nature Medicine. 2026. Read the study on Nature →