In 2005, in consideration of the increases in international travel and trade and the emergence and reemergence of international disease threats and other health risks, the Fifty-Eighth World Health Assembly adopted the revised International Health Regulations (IHR), which came into force on 15 June 2007. The purpose and scope of the new Regulations are: "To prevent, protect against, control, and provide a public health response to the international spread of disease in ways that are commensurate with and restricted to public health risks and which avoid unnecessary interference with international traffic and trade." This new edition of the IHR: - includes a new foreword and the health part of the Aircraft General Declaration (as revised by the International Civil Aviation Organization); - appendices listing States Parties to the IHR and reservations, objections and declarations received from States Parties; - is current with developments in the evolution of diseases and the factors affecting their emergence and transmission; and - introduces a series of new health documents, including ship sanitation certificates and an international certificate of vaccination or prophylaxis for travellers.