ANA CTD: anti-nuclear antibody connective tissue diseases; ANCA: antineutrophil cytoplasmic antibodies; NTM: nontuberculous mycobacteria; TB: tuberculosis; PCR: polymerase chain reaction; OD: optical density; BAL: bronchoalveolar lavage; HIV: human immunodeficiency virus; CRP: C-reactive protein. The gene discussed is CRP; the disease is tuberculosis.