The objective of the IGV (2005) is to prevent, protect, control, control and respond to the spread of diseases at the international level in a manner that is appropriate and limited to risks to public health and avoids unnecessary interference in international transport and trade. (International Health Regulations, Article 2). For more information, see the RSI fact sheets. Project-specific agreement for the research of a single faculty member or PhD student abroad. Articles 46 to 53 of the Vienna Convention on the Law of Treaties define the only ways of invalidating treaties – considered inapplicable and void by international law. A treaty is annulled, either because of the circumstances in which a State Party has acceded to the Treaty or because of the content of the treaty itself. .