However, comparison of Th17/IL-17 levels in LTBI subjects and TB patients yielded inconsistent results: some studies reported heightened Th17/IL-17 levels in LTBI subjects (101–103), others demonstrated increased Th17/IL17 in TB patients (104–107), some did not reveal differences between LTBI and TB groups (108) or found extremely low frequencies of Mtb-specific Th17 in both groups (109, 110). This evidence concerns the gene IL17A and tuberculosis.