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Updated: Dec 9, 2025

Vector Competence Analyses on Aedes aegypti Mosquitoes using Zika Virus
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First autochthonous dengue outbreak in Italy, August 2020.

Luca Lazzarini1, Luisa Barzon2,3,4, Felice Foglia5

  • 1Department of Infectious and Tropical Diseases, San Bortolo Hospital, Vicenza, Italy.

Euro Surveillance : Bulletin Europeen Sur Les Maladies Transmissibles = European Communicable Disease Bulletin
|September 11, 2020
PubMed
Summary

The first Italian dengue outbreak occurred in 2020, with five cases linked to an Indonesia importation. This highlights the need for traveler screening during the COVID-19 pandemic in areas with mosquito vectors.

Keywords:
Aedes albopictusarbovirosisautochthonousdenguefeveroutbreaksurveillance

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Area of Science:

  • * Infectious Diseases
  • * Medical Entomology
  • * Public Health

Background:

  • * The coronavirus disease (COVID-19) pandemic presented unique challenges for managing other infectious diseases.
  • * Italy has endemic populations of the Aedes albopictus mosquito, a known vector for several arboviruses.
  • * Imported infectious diseases pose a risk in regions with competent local vectors.

Purpose of the Study:

  • * To report the first outbreak of autochthonous dengue virus type 1 in Italy.
  • * To emphasize the importance of surveillance for imported febrile illnesses during the COVID-19 pandemic.
  • * To highlight the role of Aedes albopictus in local dengue transmission.

Main Methods:

  • * Case detection within a family cluster in Vicenza Province, North-East Italy.
  • * Identification of dengue virus type 1.
  • * Tracing the primary case to an importation from West Sumatra, Indonesia.

Main Results:

  • * Five locally acquired cases of dengue virus type 1 were confirmed in August 2020.
  • * The outbreak was linked to a single imported case.
  • * This marked the first documented instance of autochthonous dengue transmission in Italy.

Conclusions:

  • * Autochthonous dengue transmission is a reality in Italy, even during the COVID-19 pandemic.
  • * Vigilant screening of febrile travelers from endemic regions is critical in areas with established Aedes albopictus populations.
  • * Integrated disease surveillance is essential for preventing and controlling arboviral outbreaks.