C3 and tuberculosis: ANA: Anti-nuclear antibody; RF: Rheumatoid factor; T-SPOT.TB: Tuberculosis enzyme-linked immunospot assay; β-D-glucan: Beta-D-glucan (fungal cell wall component test); C3: Complement component 3; C4: Complement component 4; CH50: Total hemolytic complement activity; IgA: Immunoglobulin A; IgM: Immunoglobulin M; IgG: Immunoglobulin G.