American Society of International Law has released an ASIL Insight on the Swine Flu, which includes a handy description of WHO pandemic phases.
The Swine Flu Outbreak and International Law
April 27, 2009
David P. Fidler, an ASIL member, is the James Louis Calamaras Professor of Law and Director of the Center on American and Global Security at the Indiana University Maurer School of Law, Bloomington