GBP1 and tuberculosis: For example, samples showing a ∆Ct value lower or equal to −4.1 for GBP1 and higher than 5.9 for ID3 are most likely from healthy individuals, whereas those showing > −4.1 for GBP1, > 6.7 for P2RY14 and > −3.5 for IFITM3 almost certainly originate from TB patients.