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Fig. 1 | BMC Infectious Diseases

Fig. 1

From: Relative incidence and individual-level severity of seasonal influenza A H3N2 compared with 2009 pandemic H1N1

Fig. 1

Comparison between our study timeline and community epidemics. Timing of study rounds and laboratory detections of pH1N1 and sH3N2 viruses in Hong Kong from 2009 to 2011. The left y-axis applies to the grey bars, the frequency of sample recruitment by week for four study rounds, with the number of each recruitment round of recruitment indicated below the y-axis. Community epidemics were proxied by the product of weekly proportion of ILI cases among all GP consultations and the weekly proportion of positive subtype-specific test results for all influenza A strain (black), pH1N1 (red) and sH3N2 (green)

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