A total of 504 confirmed cases of hepatitis A have been identified between January and 31 May 2025 in the country. Of these, 122 are associated with transmission through sexual contact. The outbreak has primarily affected men aged 18 to 44, especially among men who have sex with men (MSM).
In addition, a second outbreak was identified in the regions of Algarve, Alentejo, and the Lisbon and Tagus Valley region, with transmission associated with poor health conditions, which has particularly affected the pediatric population.
Vaccination against hepatitis A is recommended for people visiting friends and relatives in remote rural areas and/or where hygiene conditions are poor as well as for risk persons (e.g. men who have sex with men, persons who use illicit drugs, those with chronic liver disease, and certain occupational groups).