Volume 24, Number 8—August 2018
Dispatch
Variation in Influenza B Virus Epidemiology by Lineage, China
Figure 2

Figure 2. Age-specific proportions of sentinel specimens collected from sentinel surveillance sites testing positive for influenza, China, October 2005–March 2016. A) Influenza B/Victoria and B/Yamagata lineages; B) influenza A(H1N1) and A(H3N2). Findings are based on 2,498,735 specimens collected from the sentinel hospitals. Dots indicate the original data, and lines (solid and dashed) show the estimation from a fitted smoothing function to the pattern by age.
1These authors contributed equally to this article.
2Current affiliation: Fudan University School of Public Health, Key Laboratory of Public Health Safety, Ministry of Education, Shanghai, China.
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