DEAR DR. ROACH: I had a tuberculosis (TB) skin test for my new job in May, and it was negative. They did a blood test in July. I have a question about a positive T-SPOT blood test for TB. They did a ...
The purified-protein-derivative (PPD)-based tuberculin skin test (TST) that is most commonly used to detect latent tuberculosis infection is dependent on normal T-cell function. Patients with ...
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