CD4 and tuberculosis: Moreover, QIAGEN recently developed an improved version of QFT‐GIT, QFT‐Plus, which is optimized with innovative tuberculosis‐specific antigens that elicit both CD8+ and CD4+ T‐cell responses (https://www.quantiferon.com/products/quantiferon-tb-gold-plus-qft-plus/), and has been confirmed to be more sensitive for detecting Mtb infection compared to QFT‐GIT.29