Microbiology Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli) 3bdd205f False positive tuberculin test indicates: A Atypical mycobacteria infection B Miliary tuberculosis C Immunosuppression D Extrapulmonary tuberculosis High-Yield Explanation A false-positive result may be caused by non tuberculous mycobacteria or previous administration of BCG vaccine.