Pierre N’Gou Dimba said on national television on Saturday that officials confirmed the case after testing samples from an 18-year-old girl who travelled from neighbouring Guinea.

In a separate statement, the World Health Organization (WHO) said the case was Ivory Coast’s first Ebola infection since 1994.

“This came after the Institut Pasteur in Ivory Coast confirmed the Ebola Virus Disease in samples collected from a patient, who was hospitalized in the commercial capital of Abidjan, after arriving from Guinea,” the WHO said in the statement.

The WHO said initial investigations found the patient had travelled to Ivory Coast by road and arrived in Abidjan on August 12.

Guinea – site of the 2014-2016 Ebola outbreak, the deadliest on record – experienced a four-month Ebola outbreak earlier this year that was declared over on June 19.

Guinea early this week also confirmed a first case of Marburg virus in West Africa. Marburg virus disease is highly infectious haemorrhagic fever similar to Ebola.

Transmission of both deadly diseases occurs through contact with infected bodily fluids and tissue, while symptoms include headache, vomiting blood, muscle pains and bleeding.

The WHO said there was no indication the current case in Ivory Coast is linked to the outbreak in Guinea earlier this year. It said further investigation and genomic sequencing will identify the strain and determine if there was a connection.

“It is of immense concern that this outbreak has been declared in Abidjan, a metropolis of more than 4 million people,” Matshidiso Moeti, WHO Regional Director for Africa, said in the statement.

The WHO said it was helping to coordinate a cross-border response, which included transferring 5,000 doses of Ebola vaccine from Guinea to Ivory Coast.