WHO Global Epidemiological Surveillance Standards for Influenza
Overview of WHO global standards for influenza surveillance
This document contains the WHO global standards for influenza surveillance. It is produced following a global consultation on influenza surveillance standards held in Geneva in March 2011 and subsequent review by a number of surveillance experts and the WHO regional offices, followed by a 6 month posting for review on the WHO website (see page ii of document for details). The standards recommended, including the case definitions and the chapter on thresholds, are based on a careful review of the available data and have undergone field testing.