Concept

Pandemic severity index

The pandemic severity index (PSI) was a proposed classification scale for reporting the severity of influenza pandemics in the United States. The PSI was accompanied by a set of guidelines intended to help communicate appropriate actions for communities to follow in potential pandemic situations. Released by the United States Department of Health and Human Services (HHS) on February 1, 2007, the PSI was designed to resemble the Saffir-Simpson Hurricane Scale classification scheme. The index was replaced by the Pandemic Severity Assessment Framework in 2014, which uses quadrants based on transmissibility and clinical severity rather than a linear scale. The PSI was developed by the Centers for Disease Control and Prevention (CDC) as a new pandemic influenza planning tool for use by states, communities, businesses and schools, as part of a drive to provide more specific community-level prevention measures. Although designed for domestic implementation, the HHS has not ruled out sharing the index and guidelines with interested international parties. The index and guidelines were developed by applying principles of epidemiology to data from the history of the last three major flu pandemics and seasonal flu transmission, mathematical models, and input from experts and citizen focus groups. Many "tried and true" practices were combined in a more structured manner: We also realize as we look back through history is what cities did – 44 cities did, is that many of these measures ultimately every city adopted at some point or another, and the difference may be in the timing of using these measures and whether they're coordinated in an effective way for us to really gain the benefits of them. During the onset of a growing pandemic, local communities cannot rely upon widespread availability of antiviral drugs and vaccines (See Influenza research). The goal of the index is to provide guidance as to what measures various organizations can enact that will slow down the progression of a pandemic, easing the burden of stress upon community resources while definite solutions, like drugs and vaccines, can be brought to bear on the situation.

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