The treatment of two health workers infected with the Ebola virus in 2014 with experimental medicine raised questions about whether medicine that has never been tested and shown to be safe in people should be used in the outbreak, and, given the extremely limited amount of medicine available, if it is used, who should receive it. Do you consider ethical to use unregistered interventions with unknown adverse effects for possible treatment? If it is, what criteria and conditions need to be satisfied before they can be used?