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Volume 18, Number 11—November 2012

Dispatch

Seroprevalence of Influenza A(H1N1)pdm09 Virus Antibody, England, 2010 and 2011

Katja HoschlerComments to Author , Catherine Thompson, Nick Andrews, Monica Galiano, Richard Pebody, Joanna Ellis, Elaine Stanford, Marc Baguelin, Elizabeth Miller, and Maria Zambon
Author affiliations: Health Protection Agency, London, UK (K. Hoschler, C. Thompson, N. Andrews, M. Galiano, R. Pebody; J. Ellis, M. Baguelin, E Miller, M. Zambon); and Health Protection Agency, Manchester, UK (E. Stanford)

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Figure 2

Percentage of samples with hemagglutination-inhibition titer >32 during consecutive waves of influenza activity, England, summer 2009 and 2009-10 and 2010-11 influenza seasons. Data were plotted from all available results determined by hemagglutination-inhibition assay on samples from all regions. A) Children <5 years old. B) Children 5–14 years old. C) Persons 15–24 years old. D) Persons 25–44 years old. E) Persons 45–64 years old. F) Persons 65–74 years old. G) Persons >75 years old.

Figure 2. . . . . . Percentage of samples with hemagglutination-inhibition titer >32 during consecutive waves of influenza activity, England, summer 2009 and 2009-10 and 2010-11 influenza seasons. Data were plotted from all available results determined by hemagglutination-inhibition assay on samples from all regions. A) Children <5 years old. B) Children 5–14 years old. C) Persons 15–24 years old. D) Persons 25–44 years old. E) Persons 45–64 years old. F) Persons 65–74 years old. G) Persons >75 years old. Black line, results from all regions; gray line, results from the North West and South West regions, which provided samples throughout the entire period. Error bars indicate 95% confidence intervals.

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