ON August 8, the World Health Organisation declared the West African Ebola outbreak a 'public health emergency of international concern'. The declaration came four months after the WHO reported a major Ebola outbreak in Guinea in Western Africa. Researchers traced the outbreak to a two-year old child who died on December 6, 2013. The epidemic, which broke in Guinea and spread to 3 of its neighbours – Liberia, Sierra Leone and Nigeria – is known to have already affected 2,240 people and killed 1,229.