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Sentinel surveillance of imported dengue via travellers to Europe 2012 to 2014: TropNet data from the DengueTools Research Initiative
- Andreas Neumayr1,2 , Jose Muñoz3 , Mirjam Schunk4 , Emmanuel Bottieau5 , Jakob Cramer6 , Guido Calleri7 , Rogelio López-Vélez8 , Andrea Angheben9 , Thomas Zoller2,10,17 , Leo Visser11 , Núria Serre-Delcor12 , Blaise Genton13 , Francesco Castelli14 , Marjan Van Esbroeck5 , Alberto Matteelli14 , Laurence Rochat15 , Elena Sulleiro16 , Florian Kurth17 , Federico Gobbi9 , Francesca Norman8 , Ilaria Torta7 , Jan Clerinx5 , David Poluda4 , Miguel Martinez3 , Antonia Calvo-Cano3 , Maria Paz Sanchez-Seco18 , Annelies Wilder-Smith19,20 , Christoph Hatz1,2 , Leticia Franco18,21 , for TropNet22
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View Affiliations Hide AffiliationsAffiliations: 1 Department of Medicine and Diagnostics, Swiss Tropical and Public Health Institute, Basel, Switzerland 2 University of Basel, Switzerland 3 ISGlobal, Barcelona Centre for International Health Research (CRESIB), Hospital Clínic-Universitat de Barcelona, Barcelona, Spain 4 Division of Infectious Diseases and Tropical Medicine, Medical Centre of the Ludwig-Maximilian-University (LMU), Munich, Germany 5 Department of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium 6 Department of Internal Medicine I, Section Tropical Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; Department of Clinical Research, Bernhard Nocht Institute for Tropical Medicine, Hamburg, Germany 7 Travel Medicine Unit, Department of Infectious Diseases, Amedeo di Savoia Hospital- ASLTO2, Torino, Italy 8 National Referral Unit for Tropical Diseases, Infectious Diseases Department, Ramón y Cajal University Hospital, IRYCIS, Madrid, Spain 9 Centre for Tropical Diseases, Sacro Cuore - Don Calabria Hospital, Negrar, Italy 10 Clinical Research Unit, Department of Medicine and Diagnostics, Swiss Tropical and Public Health Institute, Basel, Switzerland 11 Department of Infectious Diseases, Leiden University Medical Centre, Leiden, The Netherlands 12 Tropical Medicine and International Health Unit Vall d’Hebron-Drassanes. PROSICS. Hospital Vall d’Hebron. Institut Català de la Salut, Barcelona, Spain 13 Infectious Disease Service & Department of Ambulatory Care, University Hospital, Lausanne, Switzerland 14 University Department of Infectious and Tropical Diseases, University of Brescia and Spedali Civili General Hospital, Brescia, Italy 15 Travel Clinic, Department of Ambulatory Care and Community Medicine, University Hospital, Lausanne, Switzerland 16 Microbiology Department, Hospital Vall d´Hebron. PROSICS Barcelona. Universitat Autònoma de Barcelona, Barcelona, Spain 17 Department of Infectious Diseases and Respiratory Medicine, Charité University Medical Center, Berlin, Germany 18 National Centre for Microbiology, Instituto de Salud Carlos III, Majadahonda, Spain 19 Institute of Public Health, University of Heidelberg, Germany 20 Department of Global Health and Epidemiology, Umea University, Umea, Sweden 21 Gorgas Memorial Institute, Panama, Panama 22 http://www.tropnet.net/Andreas Neumayrandreas.neumayr unibas.ch
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Citation style for this article: Neumayr Andreas, Muñoz Jose, Schunk Mirjam, Bottieau Emmanuel, Cramer Jakob, Calleri Guido, López-Vélez Rogelio, Angheben Andrea, Zoller Thomas, Visser Leo, Serre-Delcor Núria, Genton Blaise, Castelli Francesco, Van Esbroeck Marjan, Matteelli Alberto, Rochat Laurence, Sulleiro Elena, Kurth Florian, Gobbi Federico, Norman Francesca, Torta Ilaria, Clerinx Jan, Poluda David, Martinez Miguel, Calvo-Cano Antonia, Sanchez-Seco Maria Paz, Wilder-Smith Annelies, Hatz Christoph, Franco Leticia, for TropNet. Sentinel surveillance of imported dengue via travellers to Europe 2012 to 2014: TropNet data from the DengueTools Research Initiative. Euro Surveill. 2017;22(1):pii=30433. https://doi.org/10.2807/1560-7917.ES.2017.22.1.30433 Received: 10 Feb 2016; Accepted: 21 Jun 2016
Abstract
We describe the epidemiological pattern and genetic characteristics of 242 acute dengue infections imported to Europe by returning travellers from 2012 to 2014. The overall geographical pattern of imported dengue (South-east Asia > Americas > western Pacific region > Africa) remained stable compared with 1999 to 2010. We isolated the majority of dengue virus genotypes and epidemic lineages causing outbreaks and epidemics in Asia, America and Africa during the study period. Travellers acted as sentinels for four unusual dengue outbreaks (Madeira, 2012–13; Luanda, 2013; Dar es Salaam, 2014; Tokyo, 2014). We were able to characterise dengue viruses imported from regions where currently no virological surveillance data are available. Up to 36% of travellers infected with dengue while travelling returned during the acute phase of the infection (up to 7 days after symptom onset) or became symptomatic after returning to Europe, and 58% of the patients with acute dengue infection were viraemic when seeking medical care. Epidemiological and virological data from dengue-infected international travellers can add an important layer to global surveillance efforts. A considerable number of dengue-infected travellers are viraemic after arrival back home, which poses a risk for dengue introduction and autochthonous transmission in European regions where suitable mosquito vectors are prevalent.
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