Volume 18, Number 8—August 2012
Population Diversity among Bordetella pertussis Isolates, United States, 1935–2009
|Study period||Years||Vaccine use||Simpson diversity index, % (95% CI)|
|4||1991–1996||wP/aP transition (4th–5th doses)||75.7 (65.9–85.5)|
*wP, whole cell vaccine; aP, acellular vaccine; Tdap, tetanus-diphtheria-aP.
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