Clinical features common to the three patients initially include fever, headache, diarrhoea and myalgia developing into rash and hepatic dysfunction, followed by rapid deterioration and death. Bleeding was not a marked clinical feature (NICD report (.pdf)).

There are no further known symptomatic cases, either in Zambia or in South Africa. 121 known contacts of the fatal cases are being traced in South Africa and 23 in Zambia.