Volume 18, Number 11—November 2012
Letter
Seroprevalence of Pandemic Influenza Viruses, New York, New York, USA, 2004
Figure

Figure. Seroprevalence of cross-reactive antibodies to the 1918, 1957, 1968, and 2009 pandemic influenza viruses among persons >23 years of age, New York, New York, 2004. LOESS (locally weighted scatterplot smoothing) curves represent the estimated prevalence of hemagglutination-inhibition antibody titers of >40 (positive titers) by year of birth.
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