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 3
Results of partial sequencing of isolates analyzed in a study of temporal trends in Bordetella pertussis populations, Denmark, 1949–2009*
| Partially sequenced gene, alleles detected† | No. isolates (% frequency) |
|||
|---|---|---|---|---|
| Total period | Period 1 | Period 2 | Period 3 | |
| prn | 153 (100) | 24 (100) | 50 (100) | 79 (100) |
| prn1 | 41 (27) | 15 (63) | 22 (44) | 4 (5) |
| prn2 | 86 (56) | ND | 18 (36) | 68 (86) |
| prn3 | 17 (11) | ND | 10 (20) | 7 (9) |
| prn7 | 9 (6) | 9 (38) | ND | ND |
| ptxA | 151 (100) | 23 (100) | 47 (100) | 80 (100) |
| ptxA1 | 125 (83) | 3 (13) | 42 (89) | 80 (100) |
| ptxA2 | 14 (9) | 8 (35) | 5 (11) | ND |
| ptxA4 | 12 (8) | 12 (52) | ND | ND |
| ptxP | 148 (100) | 24 (100) | 44 (100) | 80 (100) |
| ptxP1 | 82 (55) | 12 (50) | 42 (96) | 28 (35) |
| ptxP2 | 12 (8) | 12 (50) | ND | ND |
| ptxP3 | 52 (35) | ND | 2 (4) | 50 (63) |
| ptxP15 | 1 (1) | ND | ND | 1 (1) |
| ptxP17 | 1 (1) | ND | ND | 1 (1) |
| tcfA | 153 (100) | 24 (100) | 51 (100) | 78 (100) |
| tcfA2 | 141 (92) | 24 (100) | 45 (88) | 72 (92) |
| tcfA3 | 12 (8) | 0 | 6 (12) | 6 (8) |
*ND, none detected.
†Genes encoding pertactin (prn), B. pertussis toxin S1 subunit (ptxA), B. pertussis toxin promoter (ptxP), and tracheal colonization factor A (tcfA).
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