Definitions of myalgic encephalomyelitis and chronic fatigue syndrome

ME

 * 1986 Ramsay definition
 * 2007 Nightingale definition
 * 2014 London criteria

CFS

 * 1988 CDC case definition ("Holmes criteria")
 * 1991 Oxford criteria
 * 1994 CDC case definition ("Fukuda criteria")
 * 2005 CDC case definition ("Empirical definition")

Combined

 * 2003 Canadian consensus criteria
 * 2007 NICE guidelines
 * 2011 International consensus criteria
 * 2015 IOM diagnostic criteria (SEID)