Volume 15, Number 8—August 2009
Research
Bordetella pertussis Strains with Increased Toxin Production Associated with Pertussis Resurgence
Appendix Figure

Appendix Figure. Temporal trends in the frequencies of pertussis toxin promoter 3 (ptxP3) strains, notifications, and hospitalizations. In this period, 99% of the strains harbored either ptxP1 or ptxP3. In November 2001, a preschool booster immunization was introduced, which may have reduced hospitalizations.
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