1. Department of Infectious Diseases1 and
2. Department of Tuberculosis Control, Municipal Health Department ‘Zaanstreek en Waterland,’ Zaandam,2 and
3. Football Club Volendam, Volendam,3 The Netherlands, and
4. Department of TB Immunology, Statens Serum Institute, Copenhagen, Denmark4
5. Department of Immunohematology and Blood Transfusion,5 Leiden University Medical Center, Leiden,