Torner Gràcia, NúriaBroner, Sonia JudithMartínez, AnaTortajada, CeciliaGarcía de Olalla, PatriciaBarrabeig i Fabregat, IreneSala Farré, Maria RosaCamps, NeusMinguell, SofiaAlvarez, JosepFerrús, GloriaTorra, RoserGodoy i García, PereDomínguez García, ÀngelaHepatitis A Surveillance Group of Catalonia2013-05-212013-05-212012-02-151932-6203https://hdl.handle.net/2445/43602Even though hepatitis A mass vaccination effectiveness is high, outbreaks continue to occur. The aim of this study was to investigate the association between duration and characteristics of hepatitis A outbreaks. Hepatitis A (HA) outbreaks reported between 1991 and 2007 were studied. An outbreak was defined as ≥2 epidemiologically-linked cases with ≥1 case laboratory-confirmed by detection of HA immunoglobulin M (IgM) antibodies. Relationships between explanatory variables and outbreak duration were assessed by logistic regression. During the study period, 268 outbreaks (rate 2.45 per million persons-year) and 1396 cases (rate 1.28 per 105 persons-year) were reported. Factors associated with shorter duration were time to intervention (OR = 0.96; 95% CI: 0.94-0.98) and school setting (OR = 0.39; 95% CI: 0.16-0.92). In person-to-person transmission outbreaks only time to intervention was associated with shorter outbreak duration (OR = 0.96; 95% CI: 0.95-0.98). The only variables associated with shorter outbreak duration were early administration of IG or vaccine and a school setting. Timely reporting HA outbreaks was associated with outbreak duration. Making confirmed HA infections statutory reportable for clinical laboratories could diminish outbreak duration.4 p.application/pdfengcc-by (c) Torner Gràcia, Núria et al., 2012http://creativecommons.org/licenses/by/3.0/esVirus de l'hepatitis AEpidemiologiaHepatitis A virusEpidemiologyinfo:eu-repo/semantics/article6034742013-05-21info:eu-repo/semantics/openAccess22355358