Bastiaan W Haak1, W Joost Wiersinga2,3. 1. Center for Experimental and Molecular Medicine (CEMM), Amsterdam University Medical Centers-Location AMC, University of Amsterdam, Amsterdam, the Netherlands. 2. Center for Experimental and Molecular Medicine (CEMM), Amsterdam University Medical Centers-Location AMC, University of Amsterdam, Amsterdam, the Netherlands. W.J.Wiersinga@amsterdamumc.nl. 3. Department of Internal Medicine, Division of Infectious Diseases, Amsterdam University Medical Centers-Location AMC, University of Amsterdam, Amsterdam, the Netherlands. W.J.Wiersinga@amsterdamumc.nl.