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Swedish isolates used for establishment of a PFGE profile-based reference system for epidemiological typing of B. pertussis
| Period | Duration | Isolate collection | No. of isolates |
|---|---|---|---|
| Whole-cell vaccintion (Pw) | 1950-1978 | 1970-1977 | 70 |
| No general vaccination | 1979-1996 | 1986-1987 | 74 |
| 1992-1995 | 148 | ||
| Acellular vaccination (Pa) | 1997-present | 1997-2003 | 1,518 |
| Total | 1,810 |
