TABLE 2.
Clinical isolates from vaccinated and unvaccinated Swedish children collected during three periods with different pertussis vaccination schedules
| Period | Yr of collection | No. of isolates from:
|
Total | ||
|---|---|---|---|---|---|
| Vaccination status unknown | Vaccinated | Unvaccinated | |||
| Whole-cell vaccination (Pw) (1953-1979) | 1970-1977 | 71 | 71 | ||
| Without general vaccination (1979-1996) | 1986-1987 | 26 | 48 | 74 | |
| 1992-1995 | 42 | 110 | 152 | ||
| Acellular vaccination (Pa) (1996-2003)a | 1997-1998 | 42 | 134 | 176 | |
| 1998-1999 | 90 | 150 | 240 | ||
| 1999-2000 | 147 | 204 | 351 | ||
| 2000-2001 | 56 | 56 | |||
| 2001-2002 | 82 | 82 | |||
| 2002-2003 | 45 | 45 | |||
| Total | 71 | 530 | 646 | 1247 | |
a
Annually 1 October to 30 September.