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Fig. 2 | BMC Infectious Diseases

Fig. 2

From: Co-circulation of the two influenza B lineages during 13 consecutive influenza surveillance seasons in Italy, 2004–2017

Fig. 2

Proportion of B/Victoria and B/Yamagata lineages among characterized influenza B viruses in Italy, by season (2004/2005–2016/2017). The different color of the triangles (B/Victoria in orange; B/Yamagata in green) at the top of each bar represents the recommended influenza B vaccine lineage. The red rectangle indicates a mismatch between the vaccine and the predominant influenza B lineage. Asterisks on the top of the bars indicate the six seasons with a higher circulation of B viruses (> 20% of all laboratory-confirmed cases). The total number of influenza B cases registered in Italy (lower line), along with the number of characterized influenza B viruses (upper line), for each season, are also shown on the top of the graph

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BMC Infectious Diseases

ISSN: 1471-2334

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