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

Author affiliations: National Institute of Public Health and the Environment, Bilthoven, the Netherlands

Main Article

Figure 2

Figure 2. Reported pertussis cases per month, 1989-1998, cases with positive two-point serology, and cases with positive one-point serology.

Main Article

¹Vaccine effectiveness = 1 – (proportion of vaccinated cases/1 – proportion of vaccinated cases) X (1 – proportion vaccinated in the population/proportion vaccinated in the population).

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