1 Department of Infectious Disease Epidemiology, Statens Serum Institut, Copenhagen S, Denmark; European Programme for Intervention Epidemiology Training (EPIET), European Centre for Disease Prevention and Control, Stockholm, Sweden. Electronic address: [email protected].
2 Department of Infectious Disease Epidemiology, Statens Serum Institut, Copenhagen S, Denmark.
3 The Danish Veterinary and Food Administration, Glostrup, Denmark.
4 Department of Bacteria, Parasites & Fungi, Statens Serum Institut, Copenhagen, Denmark.