The specificity of unadjusted and adjusted serum retinol was lower during the dry than rainy one (52.5% vs. 88.4% and 60.0% vs. 90.7%, respectively), in CRP < 5.0 mg/L than CRP ≥ 5.0 mg/L (69.6% vs. 100% and 74.7% vs. 100%, respectively), and in the absence of helminth infections than in their presence (60.0 vs. 79.4% and 67.5% vs. 82.4%, respectively). The gene discussed is CRP; the disease is helminthiasis.