Fig. 2: Virological surveillance of seasonal influenza viruses. | Nature Communications

Fig. 2: Virological surveillance of seasonal influenza viruses.

From: Human seasonal influenza under COVID-19 and the potential consequences of influenza lineage elimination

Fig. 2

A Time series comparing FluNet data on seasonal influenza activity in the Northern and Southern Hemispheres from 2015 to July 2021, with the COVID-19 pandemic shaded in gray. Stacked bar chart (left-hand y-axis) represents the number of influenza-positive cases per week colored by subtype. Black trend-line (right-hand y-axis) shows the number of specimens tested per week. B Magnified view of the gray-shaded bar charts in A showing influenza-positive specimens from April 2020 to July 2021. Note: y-axis scales differ in each panel.

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