The 2023 dengue outbreak in Lombardy, Italy: A one-health perspective

The 2023 dengue outbreak in Lombardy, Italy: A one-health perspective

Introduction: Here we reported the virological, entomological and epidemiological characteristics of the large autochthonous outbreak of dengue (DENV) occurred in a small village of the Lombardy region (Northern Italy) during summer 2023. Methods: After the diagnosis of the first autochthonous case...

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Main Authors: Francesca Rovida, Marino Faccini, Carla Molina Granè, Irene Cassaniti, Sabrina Senatore, Eva Rossetti, Giuditta Scardina, Manuela Piazza, Giulia Campanini, Daniele Lilleri, Stefania Paolucci, Guglielmo Ferrari, Antonio Piralla, Francesco Defilippo, Davide Lelli, Ana Moreno, Luigi Vezzosi, Federica Attanasi, Marzia Soresini, Manuela Barozzi, Lorenzo Cerutti, Stefano Paglia, Angelo Regazzetti, Maurilia Marcacci, Guido Di Donato, Marco Farioli, Mattia Manica, Piero Poletti, Antonio Lavazza, Maira Bonini, Stefano Merler, Fausto Baldanti, Danilo Cereda, Antonella Sarasini, Milena Furione, Dalila Mele, Federica Bergami, Josè Camilla Sammartino, Alessandro Ferrari, Greta Romano, Antonino Maria Guglielmo Pitrolo, Maya Carrera, Rita Brugnoli, Nunzia Laini, Francesca Bonalda, Sara Arfani, Giuditta Zamboni, Fanny Delfanti, Piergiuseppe Ferrari, Anxhela Dafa, Antonella Negri, Filippa Parisi, Marcello Tirani, Michela Viscardi, Gabriele Del Castillo, Federica Morani, Francesco Scovenna, Sheila Sansebastian, Manuel Maffeo, Mario Chiari, Enrico Tallarita
Format: Article
Language:English
Published: Elsevier 2025-03-01
Series:Travel Medicine and Infectious Disease
Subjects:
DENV-1 autochthonous outbreak
Screening
Epidemiology
Dengue transmission
One health
Online Access:http://www.sciencedirect.com/science/article/pii/S1477893925000018
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Summary:Introduction: Here we reported the virological, entomological and epidemiological characteristics of the large autochthonous outbreak of dengue (DENV) occurred in a small village of the Lombardy region (Northern Italy) during summer 2023. Methods: After the diagnosis of the first autochthonous case on August 18, 2023, public health measures, including epidemiological investigation and vector control measures, were carried out. A serological screening for DENV antibodies detection was offered to the population. In the case of positive DENV IgM, a second sample was collected to detect DENV RNA and verify seroconversion. Entomological and epidemiological investigations were also performed. A modeling analysis was conducted to estimate the dengue generation time, transmission potential, distance of transmission, and assess diagnostic delays. Results: Overall, 416 subjects participated to the screening program and 20 were identified as DENV-1 cases (15 confirmed and 5 probable). In addition, DENV-1 infection was diagnosed in 24 symptomatic subjects referred to the local Emergency Room Department for suggestive symptoms and 1 case was identified through blood donation screening. The average generation time was estimated to be 18.3 days (95 % CI: 13.1–23.5 days). R0 was estimated at 1.31 (95 % CI: 0.76–1.98); 90 % of transmission occurred within 500m. Entomological investigations performed in 46 pools of mosquitoes revealed the presence of only one positive pool for DENV-1. Discussion: This report highlights the importance of synergic surveillance, including virological, entomological and public health measures to control the spread of arboviral infections.
ISSN:1873-0442

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