Between September 7 and December 23, 2009, statewide overall school absenteeism ranged from 0.0% to 29.3% and statewide ILI-related absenteeism ranged from 0.0% to 14.2%, both of which peaked the week of November 1Á7, 2009. The observed peak of school absenteeism was consistent with data observed in other ILI surveillance systems such as over-the-counter sales of cough and cold medications and visits to emergency departments ( Fig. 2) . At the peek of absenteeism, 346 of 479 (72%) of all elementary, middle and high schools in New Hampshire were reporting into the system. NH DHHS identified 103 outbreaks using the school absenteeism reporting system; a state public health nurse investigated each outbreak. Timeliness of outbreak detections were within 24 hours due to daily reporting.