As of 29 September 2022, 303 cases with identical or closely related HAV strains have been identified in Austria (7), Germany (8), Hungary (161), the Netherlands (8), Slovenia (35), Sweden (8), and the UK (76). Currently available epidemiological and microbiological data suggest that human-to-human transmission has occurred, and possibly also transmission through contaminated food.

On 15 February 2022, Hungary reported an outbreak of HAV genotype IB with the disease onset of the first case in early December 2021. To date, 161 cases (139 males, 22 females) have been confirmed with this strain in the National Hepatitis Reference Laboratory in Hungary. The weekly number of reported hepatitis A cases have been declining since June 2022. Several infected people identified themselves as men who have sex with men (MSM), suggesting possible transmission among sexual contacts. Several patients have been hospitalised.

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