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Encyclopedia > Pandemic Severity Index

The Pandemic Severity Index (PSI) is a scale or index created in January 2007 by the United States Centers for Disease Control and Prevention (CDC) designed to mimic the system for indexing the severity of hurricanes (which is the Saffir-Simpson Hurricane Scale for tropical cyclones).[1] If H5N1 evolves into a strain that is easily transmitted person to person (i.e. phase 6) and the U.S. government decides its threat to the U.S. is such that social isolation measures must be taken, then the CDC will select a PSI so local communities can immediately implement the proper social isolation measures. The Centers for Disease Control and Prevention (CDC) in Atlanta, Georgia, is recognized as the leading United States agency for protecting the public health and safety of people. ... This article is about weather phenomena. ... The Saffir-Simpson Hurricane Scale is a scale classifying most Western Hemisphere tropical cyclones that exceed the levels of tropical depression and tropical storm and thereby become hurricanes; the categories it divides hurricanes into are distinguished by the intensities of their respective sustained winds. ... Cyclone Catarina, a rare South Atlantic tropical cyclone viewed from the International Space Station on March 26, 2004 Hurricane and Typhoon redirect here. ... Influenza A virus subtype H5N1, also known as A(H5N1) or H5N1, is a subtype of the Influenza A virus that can cause illness in humans and many other animal species. ...


The University of Minnesota Center for Infectious Disease Research and Policy (CIDRAP) says: Washington Avenue Bridge at night The University of Minnesota, Twin Cities, almost always abbreviated U of M, and sometimes referred to as The U by locals, is the oldest and largest part of the University of Minnesota system. ...

"Severity level is initially based on case-fatality ratio (CFR), a single criterion that will likely be known even early in a pandemic when small clusters and outbreaks are occurring, the report says. Other measures, such as excess mortality, could be factored in later. Two events would prompt the CDC director to designate a pandemic category: the World Health Organization (WHO) declaring a phase 6 pandemic level and the US government declaring a stage 3, 4, or 5 alert."[1]

The pandemic severity index levels are: An influenza pandemic is a large scale epidemic of the influenza virus, such as the 1918 Spanish flu. ...

Recommendations for a response to a flu pandemic were based on the history of the last three major flu pandemics, mathematical models, seasonal flu transmission, and input from experts and citizen focus groups.[1] Human Flu refers to a subset of Orthomyxoviridae that create influenza in humans and are endemic in humans. ... The Asian Flu was a pandemic outbreak of influenza that originated in China in 1957 and spread worldwide that same year. ... H3N2 is a subtype of the species Influenza A virus (sometimes called bird flu virus). ... Public Notice The 1918 flu pandemic was a category 5 influenza pandemic between 1918 and 1920 caused by an unusually severe and deadly strain of the subtype H1N1 of the species Influenza A virus. ... An influenza pandemic is a large scale epidemic of the influenza virus, such as the 1918 Spanish flu. ...


The report describes these measures for battling a pandemic:

  • Isolation and treatment of people who have suspected or confirmed cases of pandemic influenza
  • Voluntary home quarantine of household contacts of those with suspected or confirmed pandemic influenza
  • Dismissing school classes and closing daycare centers
  • Changing work schedules and canceling large public gatherings[1]

CIDRAP says: "For Category 4 and 5 pandemics, the CDC recommends that all four interventions be used and that school classes be suspended for up to 12 weeks. Category 2 or 3 pandemics would warrant voluntary isolation of sick people, though other measures may be added or modified depending on the recommendations of local health authorities; for example, schools could be closed for 4 weeks instead of 12 weeks."[1]


See also

See H5N1 flu and Flu for details about the illnesses and H5N1 and H3N2 for details about the causitive agents. ... Reporting disease cases refers to modern international human infectious disease surveillance. ... The following is a timeline of severe acute respiratory syndrome (SARS). ...

Sources and notes

  1. ^ a b c d e f Roos, Robert; Lisa Schnirring (February 1, 2007). HHS ties pandemic mitigation advice to severity. University of Minnesota Center for Infectious Disease Research and Policy (CIDRAP). Retrieved on 2007-02-03.

Washington Avenue Bridge at night The University of Minnesota, Twin Cities, almost always abbreviated U of M, and sometimes referred to as The U by locals, is the oldest and largest part of the University of Minnesota system. ... This article or section does not cite its references or sources. ... February 3 is the 34th day of the year in the Gregorian Calendar. ...

Further reading

  • Full text of HHS report
  • Feb 1 CDC news release
  • Transcript of Feb 1 news conference
  • CIDRAP article Experts give qualified praise to new pandemic guidance published February 2,2007

 
 

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