424. Using wearable electronic sensors for assessing contacts between individuals at hospital: a tool for studying transmission of hospital acquired infection
Session: Poster Abstract Session: Novel Devices and Technologies
Thursday, October 18, 2012
Room: SDCC Poster Hall F-H
Background: Transmission of hospital acquired infections (HAI) is mainly based on contacts between patients (P), P and health care workers (HCWs), and between HCWs. Description and quantification of contacts at hospital are key information for identifying opportunities of HAI transmission and improving control measures.

Methods: A prospective study was performed during influenza season in 2012 in a short stay geriatric unit counting for 19 beds during 11 consecutive days. A nasal swab for influenza virus detection was done at admission, at discharge and in case of influenza like illness (ILI) during the stay for P. A nasal swab was done twice during the study and in case of ILI for HCW. The SocioPatterns project (www.sociopatterns.org) has developed a technology based on Radio Frequency IDentification badges that provides a reliable infrastructure to detect face-to-face proximity of individuals at close range (about 0 to 1.5 meter). P and HCWs were asked to wear the devices on their chests. Contacts were not recorded for visitors. Communication between RFID badges was fully encrypted and individual data anonymized.

Results: During the 11 days of the study (27/3/2012 1:00 PM to 9/3/2012 1:00 PM), 49 HCWs and 38 P cumulated 21,152 contacts counting for 297 hours with average contact duration of 50 s (min 20s, max 6,660s). A total of 15 P and 9 HCWs had ILI during the stay. Five HCWs (attack rate 10%) and 10 P (attack rate 26%) were confirmed to be infected by influenza A/H3N2 virus. For 6 P and 3 HCW with ILI, an epidemiological link was documented. A time-resolved dataset of contact patterns was generated. Analyses are ongoing and will provide contacts frequency and duration. Contact matrices between P and HCWs and between professional categories of HCWs will be presented. A focus will be done on contacts from individuals involved in the outbreak. Simulation of transmission and impact of prevention measures might be also based on these data.

Conclusion: The RFID technology provides an interesting tool to analyze the association between temporal contacts patterns and occurrence of an influenza outbreak at hospital. Collecting contacts data at hospital, using such electronic devices, is useful to better address prevention and control of known and emerging HAIs.

Philippe Vanhems, MD, PhD, Infection Control and Epidemiology Unit, Edouard Herriot Hospital, Lyon, France; Laboratory of Epidemiology and Public Health, CNRS UMR 5558, university Lyon 1, Lyon, France, Corinne Régis, Université de Lyon, Université Lyon 1, CNRS UMR 5558, Laboratoire de Biométrie et de Biologie Evolutive, Villeurbanne, France, Alain Barrat, PhD, Centre de Physique Théorique de Marseille, CNRS UMR 6207; Data Science Laboratory, Institute for Scientific Interchange (ISI) Foundation, Marseille, France, Ciro Cattuto, PhD, Data Science Laboratory, Institute for Scientific Interchange (ISI) Foundation, Torino, Italy, Jean-François Pinton, PhD, Laboratoire de Physique de l'Ecole Normale Supérieure de Lyon, CNRS UMR 5672, Lyon, France, Nagham Khanafer, PharmD, Laboratoire de Biométrie et de Biologie Évolutive, Université de Lyon, France, Lyon, France, Vanessa Escuret, PhD, Université de Lyon, Université Lyon 1, Virologie et Pathologie Humaine, CNRS FRE 3011, Hospices Civils de Lyon, National Influenza Centre (South of France), Laboratory of Virology, Bron, France, Bruno Lina, University of Lyon, Lyon, France and Nicolas Voirin, PhD, Hospices Civils de Lyon, Hygiène Epidémiologie et Prévention, Epidémiologie et Biomarqueurs de l'infection, Lyon, France


P. Vanhems, None

C. Régis, None

A. Barrat, None

C. Cattuto, None

J. F. Pinton, None

N. Khanafer, None

V. Escuret, None

B. Lina, F. Hoffmann-La Roche, Ltd: Consultant and Scientific Advisor, Consulting fee and Speaker honorarium

N. Voirin, None

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