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A Large Nosocomial Outbreak of Hepatitis C Virus Infections at a Hemodialysis Center

Published online by Cambridge University Press:  21 June 2016

Anne Savey*
Centre Hospitalier Lyon Sud, Lyon, France
Fernando Simon
from the Département Maladies Infectieuses, Institut de Veille Sanitaire, St. Maurice, France from the European Program on Intervention Epidemiology Training, Stockholm, Sweden
Jacques Izopet
from the Laboratory of Virology, Centre Hospitalier Universitaire Purpan, Toulouse, France
Agnès Lepoutre
from the Département Maladies Infectieuses, Institut de Veille Sanitaire, St. Maurice, France
Jacques Fabry
Centre Hospitalier Lyon Sud, Lyon, France
Centre Hospitalier Lyon Sud, pavillon IM, F-69 495 Pierre-Benite cedex, France.,



To identify modes of HCV transmission during an outbreak of HCV infection in a hemodialysis unit.


An epidemiologic study, virologie analysis, assessment of infection control practices and procedures, and technical examination of products and dialysis machines.


A private hemodialysis unit treating approximately 70 patients.


Detection of HCV RNA by PCR was performed among patients receiving dialysis in 2001. Case-patients were patients who had a first positive result for HCV RNA between January 2001 and January 2002 and either acute hepatitis, a seroconversion for HCV antibodies, or a previous negative result. Three control-patients were randomly selected per case-patient.


Of the 61 patients treated in the unit in 2001 and not infected with HCV, 22 (36.1%) became case-patients with onset from May 2001 to January 2002 for an incidence density rate of 70 per 100 patient-years. Phylogenic analysis identified four distinct HCV groups and an index case-patient for each with a similar virus among patients already known to be infected. No multidose medication vials or material was shared between patients. Connection to a dialysis machine by a nurse who had connected an HCV-infected patient “just before” or “one patient before” increased the risk of HCV infection, whereas using the same dialysis machine after a patient infected with HCV did not. Understating, lack of training, and breaches in infection control were documented. Direct observation of practices revealed frequent flooding of blood into the double filter on the arterial pressure tubing set.


During this outbreak, HCV transmission was mainly patient to patient via healthcare workers' hands. However, transmission via dialysis machines because of possible contamination of internal components could not be excluded.

Original Articles
Copyright © The Society for Healthcare Epidemiology of America 2005

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