I am 72 years old male. About 3 years back I was treated for tuberculosis. Recently I was coughing a lot and tuberculosis elisa test was done and the report shows: Tuberculosis IgG Antibody: 280.12 U/ml  i.e. Negative Tuberculosis IgA Antibody: 248.32 U/ml  i.e. Negative Tuberculosis IgM Antibody: 2.28 S/Co i.e. Positive Though Azithral 500 (1 tablet per day for 4 days) took care of my cough but I am worried about IgM being positive. What does it mean: Do I have tuberculosis or not? And if I have it what is the treatment?

Summarized question: What does positive Tuberculosis IgM antibody mean?