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Hemorrhagic Fever in South Africa kills Three

The U.N. health agency is investigating a mystery disease that killed three people in Johannesburg, South Africa, CNN reported.

Officials from World Health Organization believe the disease is a form of hemorrhagic fever, although tests have were negative for Ebola, Lassa fever, Rift Valley fever, Marburg fever and other main types of hemorrhagic fever.

A spokesperson from the WHO said the first death on Sept. 13 was a tour guide who became ill in Zambia. A paramedic and a nurse that assisted in the treatment of the first victim later died. All three died from external and internal bleeding, according to Reuters.

120 people are currently being monitored by the WHO.

On Sunday, it was announced that health officials believe the disease may be rodent borne.

"The causative agent of the disease ... may be a rodent borne arenavirus related to the lassa fever virus of West Africa," Lucille Blumberg of the National Institute for Communicable Diseases was quoted as saying.