Between 1 June 2016 and 31 May 2017, 17 European Union (EU) and European Economic Area countries reported 4,096 cases associated with a multi-country hepatitis A (HA) outbreak. Molecular analysis identified three co-circulating hepatitis A virus (HAV) strains of genotype IA: VRD_521_2016, V16–25801 and RIVM-HAV16–090. We categorised cases as confirmed, probable or possible, according to the EU outbreak case definitions. Confirmed cases were infected with one of the three outbreak strains. We investigated case characteristics and strain-specific risk factors for transmission. A total of 1,400 (34%) cases were confirmed; VRD_521_2016 and RIVM-HAV16–090 accounted for 92% of these. Among confirmed cases with available epidemiological data, 92% (361/393) were unvaccinated, 43% (83/195) travelled to Spain during the incubation period and 84% (565/676) identified as men who have sex with men (MSM). Results depict an HA outbreak of multiple HAV strains, within a cross-European population, that was particularly driven by transmission between non-immune MSM engaging in high-risk sexual behaviour. The most effective preventive measure to curb this outbreak is HAV vaccination of MSM, supplemented by primary prevention campaigns that target the MSM population and promote protective sexual behaviour.
|Number of pages||12|
|Publication status||Published - 16 Aug 2018|
Bibliographical noteFunding Information:
We would like to acknowledge Caterina Rizzo, Maria Elena Tosti, Paulo Nogueira and Zoran Simonovi? for their contribution in this outbreak investigation. We also would like to acknowledge all the staff at local and national levels, including the personnel working in national health institutes and reference laboratories. We are grateful to Denis Coulombier and Mike Catchpole for their review of the manuscript. We are also grateful to Silviu Ionescu for his support with the case mapping and to Meghan Hamel for providing information on Canadian cases.
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