title: Suspected small-scale interpersonal transmission of Mycobacterium tuberculosis in wards of an urban hospital in Delhi, India.
abstract: Genotypes of Mycobacterium tuberculosis causing disease were investigated in pulmonary tuberculosis patients admitted to two adjacent wards of a tuberculosis hospital in Delhi, India. Genetic markers, the insertion sequence IS6110, a direct repeat sequence, and a polymorphic GC-rich sequence supported the circumstantial epidemiologic link between eight strains of M. tuberculosis, suggesting their possible involvement in small-scale, interpersonal transmission of both drug-sensitive and drug-resistant tuberculosis. This is the first report of a suspected acquisition of M. tuberculosis among hospitalized patients in India. The use of multiple molecular typing markers and techniques unequivocally identified the exact clonality of strains isolated from the hospital. The result of this study emphasizes the need for more comprehensive investigation of high-risk situations for tuberculosis transmission and long-term follow-up analysis for identifying such instances of unsuspected transmission.
authors.affiliation: Department of Microbiology, All India Institute of Medical Sciences, New Delhi, India.
authors.forename: N Vijaya
authors.initials: NV
authors.lastname: Bhanu
authors.forename: J N
authors.initials: JN
authors.lastname: Banavalikar
authors.forename: S K
authors.initials: SK
authors.lastname: Kapoor
authors.forename: Pradeep
authors.initials: P
authors.lastname: Seth
mesh_terms: D003428:Cross Infection / Q000517:prevention & control / Q000635:transmission*; D004251:DNA Transposable Elements; D006801:Humans; D009169:Mycobacterium tuberculosis / Q000235:genetics; D012150:Polymorphism, Restriction Fragment Length; D014376:Tuberculosis / Q000517:prevention & control / Q000635:transmission*
chemical_list: D004251:DNA Transposable Elements