I just had my immunizations paper done today for West Point, and I had a positive result for the TB skin test. My chest x-ray came back negative, and according to the doctor that the positive skin test is because of a BCG vaccination I had back in 1992. However, the doctor put me on 9 months of mandatory isoniazid. Has anyone had this problem before? And will the prescription/condition in any way jeopardize my appointment?