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[Clusters of respiratory tract infections and alert strategy in nursing homes]
P Gaspard1, A Mosnier, J-M Cohen
1Équipe interétablissement d'hygiène hospitalière et de gestion des risques, coordination GROG Géronto-Alsace, centre hospitalier de Rouffach, 68250 Rouffach, France. ph.gaspard@ch-rouffach.fr
Objective:
Outbreaks of acute respiratory infections (ARI) are common in institutions for elderly people. We had for objective to investigate clusters of cases (lower respiratory tract infection and influenza-like illness [LRTI/ILI]) in order to improve and validate alert strategies in these institutions.
Methodology:
Prospective surveillance for LRTI/ILI was implemented in 11 institutions in Alsace, over five years. Clinical criteria were used to identify infected residents and clusters. Nasopharyngeal swabs were collected and rapid tests (Immunoassay) were performed to identify the influenza virus.
Results:
The three week periods were analyzed if three cases or more were recorded during the first week. This analysis demonstrated an important risk of epidemic when this number of cases was reached in healthcare units. The influenza virus (10 clusters) and respiratory syncytial virus ([RSV], two clusters) were identified.
Conclusion:
The authors confirmed and emphasized the importance of adequate surveillance for clusters of respiratory tract infection cases. Early identification of an outbreak (three cases) is an important point to prevent transmission, especially during epidemic periods and if a virus is identified in the unit or institution.
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