The median (IQR) CD4 cell count of unclassifiable patients was 77 (42–120) cells/ml, similar to definite-TB patients [86 (42–192) cells/ml], but lower than either probable- [120 (51–215) cells/ml] or non-TB patients [128 (74–235) cells/ml] (p = 0.001). The gene discussed is CD4; the disease is tuberculosis.