PMC3951152_01
Institutional serum Bordetella pertussis IgG levels, 2007 to 2011. Solid line = reference normal upper limit for serum B pertussis IgG level (9 IU/mL). Dashed line = suggested serum B pertussis IgG threshold (>27 IU/mL) consistent with likely recent pertussis infection. IU, international units.
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F1
A summary of IgG values for all 48 patients over time is presented in Figure 1.