One year after the first Ebola case in West Africa, we look at the progress made in fighting the deadly disease. There are still cases in Guinea, Sierra Leone and Liberia, the three worst-affected countries, but until a new case was confirmed on Friday, Liberia had hoped to soon be declared Ebola-free. As Katerina Vittozzi reports, the improvement is attributed to a strong and co-ordinated response from the Liberian government and its aid partners.