Rijksinstituut voor Volksgezondheid en Milieu Two cases of mild IgM-negative measles in previously vaccinated adults, the Netherlands, April and July 2011 | RIVM Jaar: 2011 Two cases of mild IgM-negative measles in previously vaccinated adults, the Netherlands, April and July 2011 | RIVM Bron: rivm.nl Download dossier (ZIP) · JSON