The World Health Organization (WHO) said in an outbreak update Tuesday that health officials in Democratic Republic of the Congo (DRC) notified the WHO of an outbreak of Ebola virus disease (EVD) in Equateur Province.

DRC map
Democratic Republic of the Congo/CIA

The index case was a pregnant woman from Ikanamongo Village who butchered a bush animal that had been killed and given to her by her husband. She became ill with symptoms of EVD and reported to a private clinic in Isaka Village. On 11 August 2014, she died of a then-unidentified haemorrhagic fever. Local customs and rituals associated with death meant that several health-care workers were exposed and presented with similar symptoms in the following week.

Between 28 July and 18 August 2014, a total of 24 suspected cases of haemorrhagic fever, including 13 deaths, have been identified. Human-to-human transmission has been established and includes the health-care personnel who were exposed to the deceased pregnant woman during surgery (one doctor and two nurses) in addition to the hygienist and a ward boy, all of whom developed symptoms and died.

Related: WHO update on Ebola transmission through food

Other deaths have been recorded among the relatives who attended the index case, individuals who were in contact with the clinic staff, and those who handled the bodies of the deceased during funerals. The other 11 cases are currently being treated in isolation centres.

The Ebola species has not been identified yet. Samples have been sent to laboratories in Kinshasa and in Gabon for confirmation of EVD and to identify the strain.

The index case and the 80 contacts have no history of travel to the EVD-affected countries in West Africa (Guinea, Liberia, Nigeria, or Sierra Leone) or history of contact with individuals from the affected areas. At this time, it is believed that the outbreak in DRC is unrelated to the ongoing outbreak in West Africa.