WHEN the Ebola virus hit west Africa in 2014, it took months to get together the money needed to combat the outbreak. Donors ended up committing more than $7bn. But the money came too late and too inefficiently, says Tim Evans, who directs the World Bank’s global health practice. Lives that could have been saved were lost. The bank estimates that GDP in Guinea, Liberia and Sierra Leone was reduced by $2.8bn.