This prospective study includes all adults aged over 18 years of age who accept to be included in the study and provided written informed consent. All patients are under long term hemodialysis for chronic renal failure. They are subjected to a questionnaire including history of contacts with tuberculosis (TB), prior treatment for TB, history of prior tuberculin skin testing, history of BCG vaccination, country of origin, trips or prolonged stays in high incidence areas, smoking history, and medications. All patients will have a chest X-ray, and simultaneous testing with the tuberculin skin test according to the Mantoux technique, and with the T-SPOT. TB and QuantiFERON Gold in tube Interferon-gamma release assays. The study analysis agreement between tests, detection of prior TB and presumptive latent tuberculosis infection, based on these items.
