title: False-positive QuantiFERON TB-Gold test due to Mycobacterium gordonae.
abstract: We report a case of QuantiFERON TB-Gold conversion associated to Mycobacterium gordonae in an elderly male from an assisted living facility without known risk factors for tuberculosis. This knowledge of environmental mycobacteria causing positive quantiferon assays is important to avoid unnecessary treatment of false-positive latent tuberculosis, especially in the absence of well-established positive predictive value of quantiferon conversion.
authors.affiliation: Division of Infectious Diseases, Stanford University School of Medicine, Stanford, CA 94305. Electronic address: kgajurel@stanford.edu.
authors.forename: Kiran
authors.initials: K
authors.lastname: Gajurel
authors.affiliation: Division of Infectious Diseases, Stanford University School of Medicine, Stanford, CA 94305.
authors.forename: Aruna K
authors.initials: AK
authors.lastname: Subramanian
mesh_terms: D000369:Aged, 80 and over; D040561:Assisted Living Facilities; D005189:False Positive Reactions; D006801:Humans; D059425:Interferon-gamma Release Tests / Q000379:methods*; D055985:Latent Tuberculosis / Q000175:diagnosis*; D008297:Male; D009170:Nontuberculous Mycobacteria / Q000302:isolation & purification*
keywords: Interferon gamma release assay; Latent tuberculosis; Mycobacterium gordonae; Quantiferon; Tuberculosis