This document is an update to an influenza pandemic plan released in 1999 by the World Health Organization (WHO), and is intended to help WHO member states to respond to the threat and occurrence of pandemic influenza. It addresses the possibility of a flu virus with pandemic potential — such as H5N1 — existing for a long time, with different levels of threat in different countries. It also redefines the phases of growing public health risk posed by new virus subtypes. It recommends actions for national authorities, and outlines measures for the WHO to take at each phase. The 52-page document is also available in Arabic, French, Russian and Spanish.


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