Correlation between clinical symptoms at presentation and PCR detected viruses.

Number of individuals (percentages) with pandemic Influenza (pH1N1), human rhinovirus (hRV), human Coronavirus (hCoV), human parainfluenza virus (hPIV), other Non Influenza Respiratory Virus (NIRVs); or negatively-testing individuals that presented with symptoms of Influenza-like illness (ILIs), Upper Respiratory Tract Infections (URTIs) or were asymptomatic.Data correspond to individuals included in the cohort during weeks 30–32 (T0), weeks 33 to 37 (T1) or weeks 38–44 (T3).Comparisons of clinical expression between T1 and T2 for each virus: pH1N1: PP = 0.006; hCoV : P = 0.038; hPIV : P = 0.001; Others NIRVs : P = 0.001; Negative swabs : P = 0.016.