Preliminary tests indicate that a mystery disease in Zambia and South Africa that has killed three people in the past month is caused by a virus from the family that includes Lassa fever, the World Health Organization (WHO) announced Oct. 13, as reports emerged that a fourth case of the illness has been confirmed. Analysis is continuing at laboratories in South Africa and the US to learn more about the virus, according to a news update released by the WHO. Investigations began after an office employee at a safari tour company in Zambia died on Sept. 14 in a hospital in Johannesburg. (UN News Service)

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