1. Travel ClinicHospital for Tropical Diseases 180 Tottenham Court Road London W1P 9LE UK
2. Institute for Social and Preventive MedicineUniversity of Zurich Sumatrastrasse 30 CH‐8006 Zurich Switzerland
3. Department of Clinical Microbiology and Infectious DiseasesThe Queen Elizabeth Hospital 28 Woodville Road Woodville South SA 5011