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Fig. 2 | BMC Infectious Diseases

Fig. 2

From: Influenza and other respiratory viral infections associated with absence from school among schoolchildren in Pittsburgh, Pennsylvania, USA: a cohort study

Fig. 2

Cumulative attack rate, by grade and school, respectively, for all children diagnosed with influenza-like illness symptoms (ILI) a, d, those that are laboratory-confirmed with any of the respiratory viruses tested b, e, and those positive for influenza virus c, f. Lines denote binomial 95% confidence intervals. Schools are arranged by district (A1 to A3, B1 to B6)

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