Volume 18, Number 5—May 2012
Research
Temporal Trends in Bordetella pertussis Populations, Denmark, 1949–2010
Randi Føns Petersen
, Tine Dalby, Ditte Marie Dragsted, Frits Mooi, and Lotte Lambertsen
, Tine Dalby, Ditte Marie Dragsted, Frits Mooi, and Lotte Lambertsen
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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