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Volume 18, Number 8—August 2012

Research

Population Diversity among Bordetella pertussis Isolates, United States, 1935–2009

Amber J. Schmidtke, Kathryn O. Boney, Stacey W. Martin, Tami H. Skoff, M. Lucia Tondella, and Kathleen M. TattiComments to Author 
Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA

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Figure 1

Timeline of pertussis vaccine introduction in the United States and appearance of alleles within the Bordetella pertussis population, 1935–2009. The 8 periods used in this study are indicated at bottom; numbers below indicate number of selected strains during that period (N = 661). wP, whole-cell pertussis vaccine; MLVA 27, multilocus variable number tandem repeat analysis type 27; aP, acellular pertussis vaccine; Tdap, tetanus-diphtheria-aP.

Figure 1. . . Timeline of pertussis vaccine introduction in the United States and appearance of alleles within the Bordetella pertussis population, 1935–2009. The 8 periods used in this study are indicated at bottom; numbers below indicate number of selected strains during that period (N = 661). wP, whole-cell pertussis vaccine; MLVA 27, multilocus variable number tandem repeat analysis type 27; aP, acellular pertussis vaccine; Tdap, tetanus-diphtheria-aP.

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