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. 2010 Nov 1;51(9):1017–1027. doi: 10.1086/656586

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© 2010 by the Infectious Diseases Society of America

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Figure 1. — Epidemic curve of influenza-like illness (ILI), by date of onset, for participants from households of students from the pandemic H1N1 (pH1N1)-affected elementary school or on-reserve households, overlaid with respiratory virus detection through reverse-transcription polymerase chain reaction. Respiratory specimens were collected as part of passive surveillance to characterize school outbreak and virus circulation in community.No cases of seasonal influenza A/H1N1, A/H3N2, or influenza B were detected in the local health area during the displayed period. The last influenza case detected in the local health area was influenza A/H3N2 in February 2009. The serologic survey population was a subset of the telephone survey population. *Virus detection is based on illness onset date.