Nigeria’s Ebola investigation is focusing on the patient’s time in Uganda after Switzerland said on October 23 that she had not travelled to the Democratic Republic of Congo. The Swiss foreign ministry told Reuters that the Ugandan-born wife of a diplomat based in Abuja was believed to have contracted the infection while visiting Uganda with her husband. WHO says the investigation into her exposure is continuing.

The statement challenges the travel account offered by Ugandan authorities, who said she had visited eastern Congo before passing through Uganda. Establishing where she went determines which health teams need to investigate her contacts before the journey to Nigeria. The dispute therefore concerns the tracing of a particular infection across national jurisdictions, alongside the work already underway in Abuja.

Nigeria confirmed the case on October 20. Its Health Ministry said the woman had arrived on an international flight from Uganda and received care for several days at a private hospital in the Federal Capital Territory before diagnosis. She was placed in isolation and was receiving treatment when the ministry announced the result. The positive laboratory test brought the hospital into the national response.

WHO’s account sets out the sequence: she arrived on October 3, developed symptoms on October 7 and sought treatment on October 11. Bundibugyo virus was confirmed on October 20. The interval between the beginning of illness and diagnosis gives investigators several settings to examine, including the care she received before Ebola was identified.

Authorities initially identified 44 contacts. The ministry said the group included healthcare workers, patients, caregivers and travel contacts. Those categories follow the places and relationships through which someone who is ill may encounter others. Tracing assigns follow-up to particular people rather than treating every traveller or resident as having the same exposure.

The Nigeria Centre for Disease Control and Prevention activated its incident management system to coordinate that work with the Health Ministry and the Federal Capital Territory’s health authorities. The hospital is receiving support for infection prevention and control. The response therefore combines investigation outside the facility with changes to the conditions in which staff continue caring for patients inside it.

WHO and partners are supporting the investigation, laboratory work and protective supplies for health workers. The agency has urged countries to keep surveillance, clinical teams and rapid response arrangements ready. Its concern extends to public and private facilities, since the first encounter with a patient may take place outside a specialist treatment centre.

Kenya’s investigation provides a separate account within the same regional emergency. The European Centre for Disease Prevention and Control’s October 23 assessment records nine confirmed cases there, including one death. The first case was reported on October 6. All eight secondary cases were linked to the first patient and were already in quarantine when they developed symptoms. The agency says all 135 listed contacts were being followed up as of October 22.

The Kenyan figures show why identifying contacts and diagnosing infections are different stages of the response. A person followed by a health team has a recorded reason for monitoring; a confirmed case has a laboratory diagnosis. The number under follow-up consequently describes the reach of the investigation, while the case total describes infections detected within it.

The ECDC assessment also records the Nigerian case and the continuing contact investigation. It recommends vigilance and preparedness for possible imported infections, alongside travel information for people going to affected areas. WHO advises against restrictions on travel or trade with affected countries, while calling for stronger monitoring at points of entry and workable response plans.

Those positions place early recognition and a functioning health response at the centre of containment. An airport check is one point in a journey that may also include a home, a clinic and onward travel. Cooperation between the authorities responsible for those settings is needed to reconstruct a patient’s movements and ensure that people requiring follow-up can be reached.

For Abuja, the immediate work remains the patient’s care, the hospital response and the monitoring of identified contacts. The Swiss statement changes the account of the journey investigators are examining before her arrival. Completing that history while maintaining contact follow-up is now the practical link between the investigation in Uganda and the response in Nigeria.