It is important to be informed about vaccinations and other health requirements for your destination country. In some cases, preventive medicines and vaccinations may require several doses over a period of time prior to departure, in others you may be required to complete some formalities and tests after your arrival. For up to date requirements, contact the nearest embassy or consulate of your destination country as soon as possible. In addition to what is required, you should discuss any further recommendations with your physician.
An international Yellow Fever vaccination certficate, which is good for ten years, is required for entry to Sierra Leone for anyone over nine months of age.