France has confirmed its first Ebola case in the country during the current outbreak, as a doctor returning from a humanitarian mission in the Democratic Republic of the Congo tested positive, French health authorities said.

In a statement on Wednesday, the French Health Ministry said the healthcare worker was operating in one of the areas where the virus was circulating.

“The patient is being treated at a leading healthcare facility, following strict biosafety protocols,” the ministry said. “All precautionary measures, including the patient’s isolation, were implemented upon arrival in France, with transfer to the hospital under secure conditions to prevent any risk of contamination,” it said.

An epidemiological investigation is under way to identify individuals who may have been in contact with the patient. They will be contacted by health authorities to self-isolate for 21 days, the statement added.

Since May, the northeastern Ituri province of the DRC has been the epicentre of an Ebola outbreak, which has killed more than 260 people and infected more than a thousand so far in the central African country. Cases have also been reported in neighbouring Uganda.

On May 17, the World Health Organization (WHO) declared the outbreak a “public health emergency of international concern”.

Most previous Ebola outbreaks in DRC were caused by a virus called Ebola Zaire, but this outbreak is caused by a different strain called Bundibugyo, for which there are currently no approved vaccines or treatments.