The 2023 Dengue Outbreak in Lombardy, Italy: A One-Health Perspective
Francesca Rovida, Marino Faccini, Carla Molina Gran\'e, 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

TL;DR
This study details the 2023 dengue outbreak in Lombardy, Italy, highlighting the epidemiological, virological, and entomological aspects, and emphasizes the importance of integrated surveillance and control measures in managing arboviral outbreaks.
Contribution
It provides a comprehensive analysis of a local dengue outbreak using multidisciplinary approaches, including modeling, which is novel for this region.
Findings
20 confirmed and probable cases identified
Average transmission generation time estimated at 18.3 days
R0 estimated at 1.31, with most transmission within 500m
Abstract
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 18 August 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…
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