Changes in the age distribution of SARI hospitalizations in Chile, May-December 2009. Daily time series of SARI hospitalizations among students (5–20 years, red curve) and other age groups (blue curve) and daily ratio of student to nonstudent SARI hospitalizations. The grey shaded area indicates the winter school vacation period from July 11th to July 26th, 2009.
Chowell et al. BMC Infectious Diseases 2012 12:298 doi:10.1186/1471-2334-12-298