Volume 6, Number 4—August 2000
Research
Reemergence of Pertussis in the Highly Vaccinated Population of The Netherlands: Observations on Surveillance Data
Hester E. de Melker
, J.F.P. Schellekens, S.E. Neppelenbroek, F.R. Mooi, H.C. Rümke, and M.A.E. Conyn-van Spaendonck
, J.F.P. Schellekens, S.E. Neppelenbroek, F.R. Mooi, H.C. Rümke, and M.A.E. Conyn-van SpaendonckTable 1
Reported cases, hospitalizations, ratios of reported cases to hospitalizations, positive 2-point serology and positive 1-point serology, 1976-1998
| Yr | Reports | Hosps | Pos, 2-point test | Pos, 1-point test | Ratio of reports/hosps | Ratio of reports/pos.2-point test | Ratio of reports/pos.1-point test |
|---|---|---|---|---|---|---|---|
| 1976a | 4 | 52 | NA | NA | 0.1 | NA | NA |
| 1977 | 25 | 93 | NA | NA | 0.3 | NA | NA |
| 1978 | 1 | 32 | NA | NA | 0.0 | NA | NA |
| 1979 | 26 | 43 | NA | NA | 0.6 | NA | NA |
| 1980 | 30 | 65 | NA | NA | 0.5 | NA | NA |
| 1981b | 50 | 76 | NA | NA | 0.7 | NA | NA |
| 1982 | 80 | 98 | NA | NA | 0.8 | NA | NA |
| 1983 | 200 | 223 | NA | NA | 0.9 | NA | NA |
| 1984c | 534 | 200 | NA | NA | 2.7 | NA | NA |
| 1985 | 1522 | 313 | NA | NA | 4.9 | NA | NA |
| 1986 | 2159 | 388 | NA | 2717 | 5.6 | NA | 0.8 |
| 1987 | 2709 | 474 | NA | 3295 | 5.7 | NA | 0.8 |
| 1988d | 112 | 92 | NA | NA | 1.2 | NA | NA |
| 1989 | 523 | 221 | 350 | 1760 | 2.4 | 1.5 | 0.3 |
| 1990 | 397 | 157 | 278 | 1204 | 2.5 | 1.4 | 0.3 |
| 1991 | 145 | 82 | 110 | 411 | 1.8 | 1.3 | 0.4 |
| 1992 | 160 | 101 | 238 | 861 | 1.6 | 0.7 | 0.2 |
| 1993 | 346 | 288 | 482 | 1489 | 1.2 | 0.7 | 0.2 |
| 1994 | 519 | 276 | 498 | 1867 | 1.9 | 1.0 | 0.3 |
| 1995 | 341 | 162 | 272 | 1070 | 2.1 | 1.3 | 0.3 |
| 1996 | 4231 | 513 | 1885 | 7854 | 8.2 | 2.2 | 0.5 |
| 1997e | 2671 | 436 | 924 | 4107 | 6.1 | 2.9 | 0.7 |
| 1998f | 1582 | NA | 294 | 2187 | NA | 5.4 | 0.7 |
aMandatory case reporting introduced.
bIgA assay introduced.
cIgG assay introduced.
dCase definition for reporting (including strict criteria for interpretation of serologic tests) introduced.
eFormal acceptance of positive one-point serologic test.
fData from January to September 1998.
1-point test = cases with one-point serology; 2-point test = cases with two-point serology; NA=not available.
