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© 1986 Oxford University Press

research-article

A Person to Person Hepatitis A Outbreak

D GRECO*, G DE GIACOMI*, G P PIERSANTE**, L BIBBY{dagger}, M NICASTRO{ddagger} and P CAVALCANTI§

* Laboratorio di Epidemiologia e Biostatistica, Istituto Superiore di Sanità Rome, Italy
** Laboratorio di lgiene e Profilassi USL/9, Cosenza
{dagger} Communicable Disease Surveillance Centre, PHLS Colindale, London, UK
{ddagger} Servizio Igiene Pubblica USL/13, S. Giovanni in Fiore (CS)
§ Servizio Microbiologia e Virologia, Ospedale Regionale USL/9, Cosenza

A person to person outbreak of hepatitis A is described: 90 cases of hepatitis A occurred in a small town in Calabria, southern Italy; all cases were under 18 years of age with the highest age-specific incidence rate in the 6–10 year age group.

Transmission was identified by tracing close contacts with other incubating or active cases: only eight out of 90 cases were not identified as having a very probable or possible contact with an infecting case. Transmission was high between family members leading to a secondary family attack rate of 51% in children under 16. An enteric disease educational campaign was carried out together with lgG and no cases of hepatitis A were reported in the two years following the investigation.

Received 1 October 1984


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