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Volume 18, Number 5—May 2012

Research

Temporal Trends in Bordetella pertussis Populations, Denmark, 1949–2010

Randi Føns PetersenComments to Author , 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)

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Table 4

MASTs detected in isolates analyzed in a study of temporal trends in Bordetella pertussis populations, Denmark, 1949–2009*

MASTdk Allele types in MASTdk
No. isolates (% frequency)†
prn ptxA ptxP tcfA Total period, n = 142 Period 1, n = 24 Period 2, n = 41 Period 3, n = 77
MAST1.dk 2 1 3 2 50 (35) ND 2 (5) 48 (63)
MAST2.dk 2 1 1 2 26 (18) ND 9 (22) 17 (22)
MAST3.dk 1 1 1 2 22 (15) 3 (13) 17 (42) 2 (3)
MAST4.dk 1 2 1 2 13 (9) 8 (33) 5 (12) ND
MAST5.dk 7 4 2 2 8 (6) 8 (33) ND ND
MAST6.dk 3 1 1 3 8 (6) ND 3 (7) 5 (7)
MAST7.dk 3 1 1 2 5 (3) ND 4 (10) 1 (1)
MAST8.dk 1 4 2 2 3 (2) 3 (13) ND ND
MAST9.dk 2 1 1 3 2 (1) ND 1 (2) 1 (1)
MAST10.dk 2 1 15 2 1 (1) ND ND 1 (1)
MAST11.dk 7 2 2 2 1 (1) 1 (4) ND ND
MAST12.dk 3 1 3 2 1 (1) ND ND 1 (1)
MAST13.dk 1 1 17 2 1 (1) ND ND 1 (1)
MAST14.dk 1 4 1 2 1 (1) 1 (4) ND ND

*Sequence types are given in the order prn-ptxA-ptxP-tcfA. MASTs, multilocus sequence types; MASTdk, MAST types detected in Denmark during 1949–2010. ND, none detected.
†Genetic diversity index calculated on multilocus variable-number tandem repeat analysis types. Calculations were done by using the online tool Comparing Partitions (www.comparingpartitions.info). Simpson’s index of diversity (95% CI) was 0.80 (0.76–0.84) for the total period, 0.77 (0.68–0.86) for period 1, 0.76 (0.67–0.85) for period 2, and 0.56 (0.45–0.67) for period 3.

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