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 2. . . Temporal trends in the frequency of multilocus variable-number tandem repeat analysis types (MTs) of Bordetella pertussis isolates collected in Denmark, 1949–2010. MTs represented in 1–3 isolates are compiled into 1 group denoted minor types. Years containing 1 or 2 isolates are combined with another year in the same time period, as indicated. The number of isolates analyzed each year/years is given above each column.
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