Rosendal, Ebbavon Schreeb, SebastianGomes, AlexandreLino, SaraGrau-Pujol, BertaMagalhães, SaraRicoca Peixoto, VascoRoque, CarlaMoreno, JoanaMaltez, FernandoAlmeida, FernandoSá Machado, RitaMarinho, Rui TatoVasconcelos, Paulade Sousa, RitaVieira Martins, João2025-02-122025-02-122024-05-23Euro Surveill. 2024;29(21):pii=2400272. doi: 10.2807/1560-7917.ES.2024.29.21.24002721560-7917http://hdl.handle.net/10400.18/10339Rapid communicationAn outbreak of hepatitis A is ongoing in Portugal, with 71 confirmed cases from 7 October 2023 to 24 April 2024. Most cases are male, aged 18-44 years, with many identifying as men who have sex with men (MSM) and reported as suspected sexual transmission. Phylogenetic analysis identified the subgenotype IA, VRD 521-2016 strain, last observed in an MSM-associated multi-country outbreak in 2016 to 2018. We wish to alert colleagues in other countries to investigate potential similar spread.engHepatitis AHepatitis A VirusMSMGenotypingOutbreakSexual TransmissionPortugalInfecções Sexualmente Transmissíveisjournal article10.2807/1560-7917.ES.2024.29.21.240027238785087