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Hester E. de Melker, J.F.P. Schellekens, S.E. Neppelenbroek, F.R. Mooi, H.C. Rümke, and M.A.E. Conyn-van Spaendonck
National Institute of Public Health and the Environment, Bilthoven, the Netherlands
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| Back to article Figure 2. Reported pertussis cases per month, 1989-1998, cases with positive two-point serology, and cases with positive one-point serology. |
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