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Table 1 Reference dates representing the beginning of each seasonal influenza epidemic investigated in the study

From: Methods for detecting seasonal influenza epidemics using a school absenteeism surveillance system

School Year Influenza Epidemic Reference Date
2008–2009 January 20th, 2009
2010–2011 December 14th, 2010
2011–2012 January 9th, 2012
2012–2013 October 26th, 2012
2013–2014 November 27th, 2013
2014–2015 December 8th, 2014
2015–2016 November 17th, 2015
2016–2017 December 15th, 2016
2017–2018 December 6th, 2017
  1. The reference date was the report date for the second of two laboratory-confirmed influenza cases reported within seven days of each other for the first time in an influenza season