N (%) of patients who received Flu Vaccine in the period
ARI: Acute respiratory infection, ILI: Influenza-like illness, Flu: Influenza virus, HRSV: respiratory syncytial virus A and B, HMPV: metapneumovirus, HPIV: parainfluenza virus 1 and 3, HBov: bocavirus, HAdv: adenovirus, HRV: rhinovirus, HCov: coronavirus OC43 and 229E. SV1: Surveillance 1, from March to August 2007. SV2: Surveillance 2, from March to August 2008, influenza vaccine was given in this period.* Poisson’s test.