Ongoing outbreak of hepatitis A associated with sexual transmission among men who have sex with men, Portugal, October 2023 to April 2024

Rosendal, Ebba; von Schreeb, Sebastian; Gomes, Alexandre; Lino, Sara; Grau-Pujol, Berta; Magalhães, Sara; Ricoca Peixoto, Vasco; Roque, Carla; Moreno, Joana; Maltez, Fernando; Almeida, Fernando; Sá Machado, Rita; Marinho, Rui Tato; Vasconcelos, Paula; de Sousa, Rita; Vieira Martins, João

http://hdl.handle.net/10400.18/10339

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Authors

Rosendal, Ebba

von Schreeb, Sebastian

Ricoca Peixoto, Vasco

Roque, Carla

Moreno, Joana

Maltez, Fernando

Abstract(s)

An 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.