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Volume 15, Number 8—August 2009

Research

Bordetella pertussis Strains with Increased Toxin Production Associated with Pertussis Resurgence

Frits R. MooiComments to Author , Inge H.M. van Loo, Marjolein van Gent, Qiushui He, Marieke J. Bart, Kees J. Heuvelman, Sabine C. de Greeff, Dimitri Diavatopoulos, Peter Teunis, Nico Nagelkerke, and Jussi Mertsola
Author affiliations: National Institute for Public Health and the Environment, Bilthoven, the Netherlands (F.R. Mooi, M. van Gent, M.J. Bart, K.J. Heuvelman, S.C. de Greeff, D. Diavatopoulos, P. Teunis); Maastricht University Hospital, Maastricht, the Netherlands (I.H.M. van Loo); National Public Health Institute, Turku, Finland (Q. He); United Arab Emirates University, Al Ain, United Arab Emirates (N. Nagelkerke); University of Turku, Turku (J. Mertsola)

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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.

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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