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Clustering of persons with resistancea to Mtb infection in the subset of households with at least 1 resistor household contact (HHC; n = 49). Abbreviations: HHC, household contact; Mtb, Mycobacterium tuberculosis. aUsing the definition with 71 resisters (all levels of exposure, tuberculin skin test [TST] 0 mm, negative follow-up interferon-gamma release [IGRA]).
