We warmly thank Fabienne B. Fischer and Manuel Wiederkehr for their scientific input and support in coordinating the study and data collection and Jan Hattendorf for the statistical support. We are grateful for the unfailing support of the entire SwissLEGIO study team during data collection: Gabriel Escher, Natascha Roser, Dominik Schnyder, Chiara Strozzi, Malina Vaucher, Mariasole Villa, Paula Savary, Elise Blandenier, Estelle Prêtre and Lucie Prêtre. At the Federal Office of Public Health, we thank Marianne Jost, Mirjam Mäusezahl-Feuz, and Sabine Basler for inputs and discussions surrounding the SwissLEGIO case‒control study. Finally, we would like to thank all the additional hospital staff from the SwissLEGIO hospital network for their support during the CALD patient recruitment and data collection: Dr. Andréa Künzli, Dr. Olivier Clerc and Camille Schilt from the cantonal hospital Neuchâtel; Maira Biggiogero from the Clinica Moncucco; Jane Frangi and Luisa Vicari from the Ente Ospedaliero Cantonale; Vanessa Deggim-Messmer from the cantonal hospital Fribourg; Dr. Mikaël de Lorenzi-Tognon from the university hospital Geneva; Daniela Hirter and Pia Scherler from the Insel university hospital Bern; Dr. Peter M. Keller from the university hospital Basel; Kristin Abig, Andrea Kloetzer, Dr. Susanne Graf, and Dr. Carmen Volken from the cantonal hospital Baselland; and Dr. Emily West from the university hospital Zurich.

The SwissLEGIO hospital network:

Isabel Akers (Departement Innere Medizin, Spital Limmattal, Schlieren, Switzerland), Michele Arena (Clinical Research Unit, Clinica Moncucco, Lugano, Switzerland), Diane Bandeira (Laboratoire de microbiologie, Hôpital cantonal de Fribourg, Fribourg, Switzerland), Livia Berlinger (Medical Microbiology, Cantonal Hospital Lucerne, Luzern, Switzerland), Enos Bernasconi (Infectious Diseases Service, Ente Ospedaliero Cantonale, Lugano, Switzerland; University of Geneva, Genève, Switzerland; University of Southern Switzerland, Lugano, Switzerland), Delphine Berthod (Central Institute, Valais Hospitals, Sion, Switzerland), Maria Boesing (University Center for Internal Medicine, Kantonsspital Baselland, Liestal, Switzerland; University of Basel, Basel, Switzerland), Romana C. Calligaris-Maibach (Zentrallabor Mikrobiologie, Kantonsspital Baden, Baden, Switzerland), Riccarda Capaul (Zentrallabor, Kantonsspital Graubünden, Chur, Switzerland), Christian Chuard (Service d’infectiologie, Hôpital cantonal de Fribourg, Fribourg, Switzerland), Antony Croxatto (ADMED Microbiology, La Chaux-de-Fonds, Switzerland), Sara Droz (Institute for Infectious Diseases, University of Bern, Bern, Switzerland), Alexis Dumoulin (Central Institute, Valais Hospitals, Sion, Switzerland), Veronique Erard (Service d’infectiologie, Hôpital cantonal de Fribourg, Fribourg, Switzerland), Alessandra Franzetti Pellanda (Clinical Research Unit, Clinica Moncucco, Lugano, Switzerland), Andrée Friedl (Klinik für Infektiologie & Infektionsprävention, Kantonsspital Baden, Baden, Switzerland), Urs Führer (Infektiologie, Spitalzentrum Biel, Biel, Switzerland), Valeria Gaia (Reference Center for Legionella, Department of Laboratory Medicine, Ente Ospedaliero Cantonale, Bellinzona, Switzerland), Christian Garzoni (Clinic of Internal Medicine and Infectious Diseases, Clinica Moncucco, Lugano, Switzerland), Gilbert Greub (Lausanne University Hospital, Lausanne, Switzerland; Institute of Microbiology, University of Lausanne, Lausanne, Switzerland), Christine Gutmann (Infectious Diseases Service, Kantonsspital Winterthur, Winterthur, Switzerland), Eva Hitz (Institut für Labormedizin, Kantonsspital Aarau AG, Aarau, Switzerland), Philipp Kaiser (Infectious Diseases Service, Cantonal Hospital Lucerne, Luzern, Switzerland), Jörg Leuppi (University Center for Internal Medicine, Kantonsspital Baselland, Liestal, Switzerland; University of Basel, Basel, Switzerland), Irena Mitrović (Medical Microbiology, Cantonal Hospital Lucerne, Luzern, Switzerland), Fabienne Nieland (Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Zürich, Switzerland; University of Zurich, Zürich, Switzerland), Matthaios Papadimitriou-Olivgeris (Infectious Diseases Service, Lausanne University Hospital, Lausanne, Switzerland; Central Institute, Valais Hospitals, Sion, Switzerland), Roberta Petrino (Emergency Medicine Unit, Department of Critical Care, Ente Ospedaliero Cantonale, Lugano, Switzerland), Benjamin Preiswerk (Infektiologie, Stadtspital Zürich, Zürich, Switzerland), Martin Risch (Zentrallabor, Kantonsspital Graubünden, Chur, Switzerland), Jacques Schrenzel (Division of Laboratory Medicine, Geneva University Hospitals, Genève, Switzerland), Philip E. Tarr (University Center for Internal Medicine, Kantonsspital Baselland, University of Basel, Basel, Switzerland), Maria C. Thurnheer (Department of Infectious Diseases, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland), Miriam Vazquez (Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Zürich, Switzerland; University of Zurich, Zürich, Switzerland), Alexander Wepf (Institute for Laboratory Medicine, Kantonsspital Winterthur, Winterthur, Switzerland).