A headteacher, a motorcycle taxi driver and a travel agent are among those who are counting the human and economic cost of the virus A headteacher, a motorcycle taxi driver and a travel agent are among those who are counting the human and economic cost of the virus Justin Keno watches more than 400 pupils stream through the Nelson Mandela school’s gate each morning, and wonders which of them might be carrying Ebola . The institution’s principal has done everything he can to prevent the spread