Book excerpt: In response to the call of the 48th World Health Assembly for a substantial revision of the International Health Regulations, this new edition of the Regulations will enter into force on June 15, 2007. The purpose and scope of the 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." The Regulations also cover certificates applicable to international travel and transport, and requirements for international ports, airports and ground crossings.