1. Institut Medizinische Mikrobiologie und Hygiene, Medizinische Fakultät TU Dresden, Dresden, Germany
2. Department of Respiratory Infections, Meningitis and STIs, Statens Serum Institut, Copenhagen, Denmark
3. Karolinska Hospital, Stockholm, Sweden
4. Bundesstaatliche Baktiologisch-serologische Untersuchungsanstalt, Vienna, Austria
5. Scottish Legionella Reference Laboratory, Stobhill Hospital, Glasgow, Scotland
6. Istituto Cantonale Batteriologico, Lugano, Switzerland
7. Respiratory and Systemic Infection Laboratory, PHLS Central Public Health Laboratory, London, United Kingdom