An absenteeism reporting form was developed and placed on a NH DHHS website. Access to the reporting form website was through a secure NH Department of Education (DOE) web portal, and school nurses were asked to voluntarily report data into the system. The questionnaire asked for the number of students absent, the number of students absent for ILI, the number of staff absent and the number of staff absent for ILI in addition to the name of the reporting school ( Fig. 1 ). Data were exported and analyzed daily by NH DHHS staff using Microsoft Excel. School enrollment data for each school were provided by DOE so that rates of absenteeism could be calculated. Rates for overall absenteeism and absenteeism due to ILI were aggregated by school administrative unit (SAU) and posted on the NH DHHS website twice weekly in the form of a map. Schools reporting absenteeism greater than 10% for any given day were contacted to determine whether an ILI outbreak was occurring and to recommend control measures.