From multiple measles genotype D8 introductions in 2024 to sustained B3 local transmission in and around Milan, northern Italy, January to April 2025
An outbreak of measles virus genotype B3 is ongoing in Milan and surrounding areas since February 2025, with 27 cases identified in 32 laboratory-confirmed measles cases. Most cases were locally acquired and young adults. Phylogenetic analysis indicated the presence of a unique lineage closely related to strains circulating in Morocco. The lack of epidemiological links between several affected individuals suggests case numbers are being underestimated. The continuous transmission raises concerns about the potential re-establishment of endemic circulation in northern Italy.
Authors
- Silvia Gioacchini (ORCID: https://orcid.org/0000-0002-0912-1330)
- María Gori (ORCID: https://orcid.org/0000-0001-6478-2791)
- Danilo Cereda (ORCID: https://orcid.org/0000-0001-5945-5710)
- A. Amendola (ORCID: https://orcid.org/0000-0002-0499-8977)
- Sabrina Senatore
- Luca Imeri (ORCID: https://orcid.org/0000-0003-0753-004X)
- Silvia Bianchi (ORCID: https://orcid.org/0000-0002-1365-9408)
- Clara Fappani (ORCID: https://orcid.org/0000-0002-1573-5531)
- Gabriele Del Castillo (ORCID: https://orcid.org/0000-0002-3331-2815)
- Simone Villa (ORCID: https://orcid.org/0000-0002-0753-8853)
- Emilio D’Ugo (ORCID: https://orcid.org/0000-0001-5852-7575)
- Raoul Fioravanti (ORCID: https://orcid.org/0000-0002-0151-0331)
- Paola Bucci (ORCID: https://orcid.org/0000-0003-0615-1013)
- Marino Faccini (ORCID: https://orcid.org/0000-0001-9277-369X)
- Fabio Magurano (ORCID: https://orcid.org/0000-0002-0394-7043)
- Daniela Colzani (ORCID: https://orcid.org/0000-0002-4079-1957)
- Melissa Baggieri (ORCID: https://orcid.org/0000-0002-0226-7599)
- Luigi Vezzosi (ORCID: https://orcid.org/0000-0001-6461-2231)
- Priscilla Pasutto (ORCID: https://orcid.org/0009-0002-1689-2069)
- Lucia Tieghi
Institutions
- University of Milan (IT)
- Istituto Superiore di Sanità (IT)
- Ministero della Salute (IT)
- Regione Lombardia
Publication Details
- Journal
- Eurosurveillance
- Published
- 2025-05-22
- DOI
- https://doi.org/10.2807/1560-7917.es.2025.30.20.2500315
- Citations
- 2
- Primary Topic
- Virology and Viral Diseases
- Type
- article
- Field-Weighted Citation Impact
- 2.71