Temporal Trends in Bordetella pertussis Populations, Denmark, 1949–2010
Randi Føns Petersen , Tine Dalby, Ditte Marie Dragsted, Frits Mooi, and Lotte Lambertsen
Author affiliations: Statens Serum Institut, Copenhagen, Denmark (R.F. Petersen, T. Dalby, L. Lambertsen); private practitioner, Frederiksberg, Denmark (D.M. Dragsted); National Institute for Public Health and the Environment (RIVM), Bilthoven, the Netherlands (F. Mooi)
Figure 3. . . Temporal trends in the frequencies of the alleles of pertactin (prn) (A), the pertussis toxin subunit S1 (ptxA) (B), the pertussis toxin promoter (ptxP) (C), and the tracheal colonization factor A (tcfA) (D) of Bordetella pertussis isolates collected in Denmark, 1949–2010. The number of isolates analyzed each year/years is given above each column. Years containing 1 or 2 isolates are combined with another year in the same time period, as indicated
The opinions expressed by authors contributing to this journal do not necessarily reflect the opinions of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.