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. Author manuscript; available in PMC: 2014 Nov 1.
Published in final edited form as: Antiviral Res. 2013 Sep 4;100(2):10.1016/j.antiviral.2013.08.023. doi: 10.1016/j.antiviral.2013.08.023

Figure 1.

Figure 1

Frequency of laboratory-confirmed cases, influenza B virus-associated pediatric mortality, and proportion of Yamagata lineage across the Northern Hemisphere. A) Frequency of circulation of influenza B viruses during 2004-2013. Data from Centers for Disease Control and Prevention (CDC, USA), National Institute for Medical Research (NIMR, Europe), and National Institute of Infectious Diseases (NIID, Japan). B) Influenza-associated pediatric mortality in the United States (2004-2013) delineated by influenza subtype. Influenza A and B indicate co-infections. Pediatric ages: < 18 years old, data from CDC, USA. C) Proportion of influenza B strains subtyped as Yamagata lineage in the United States, Europe, and Japan. Years Yamagata lineage included in seasonal influenza vaccine: 2004-5, 2005-6, 2008-9, and 2012-13. Data from CDC, WHO, and NIID.