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Impact of a 14-year screening programme on tuberculosis transmission among the homeless in Paris
DESIGN: Between 1994 and 1997, an active case-finding programme was implemented in homeless shelters using a mobile radiological screening unit, and continued from 1997 to 2007. During these periods, the strains isolated from TB cases diagnosed in the homeless were genotyped by restriction fragment length polymorphism analysis using the insertion sequence IS6110 as a probe.
RESULTS: Between 1994 and 2007, 313 new TB cases were diagnosed among the homeless population: 179 through the programme among shelter users, and 134 among homeless people not using shelters. Half of the strains were clustered in 35 distinct patterns (2–48 cases/cluster). The clustering of TB cases steadily decreased in shelters during the 13 years of the survey, from 14.3 to 2.7 related cases per year (P < 0.01) and from 75% to 30% of related cases among all TB cases (P < 0.01). In contrast, there was only a slight trend towards a decrease in homeless people not using shelters.
CONCLUSION: Active case finding in homeless shelters resulted in a decrease in case clustering, mainly in shelter users. Genotyping contributed to confirming the positive impact of the intervention.
Keywords: DNA fingerprinting; active case-finding programme; homeless; tuberculosis
Document Type: Research Article
Affiliations: 1: Laboratoire de Bactériologie–Hygiène, Université Pierre et Marie Curie, Paris, France; Laboratoire de Bactériologie–Hygiène, Hôpital Pitié–Salpêtrière, Assistance publique–Hôpitaux de Paris, Paris, France; Centre National de Référence des Mycobactéries et de la Résistance des Mycobactéries aux Antituberculeux, Paris, France 2: Direction de l'Action Sociale de l'Enfance et de la Santé, Paris, France 3: Laboratoire de Bactériologie–Hygiène, Université Pierre et Marie Curie, Paris, France; Laboratoire de Bactériologie–Hygiène, Hôpital Pitié–Salpêtrière, Assistance publique–Hôpitaux de Paris, Paris, France; Centre National de Référence des Mycobactéries et de la Résistance des Mycobactéries aux Antituberculeux, Paris, France
Publication date: 01 May 2012
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