Figure 4. Percentage of positive response to IFN-γ and IP-10-based tests in response to RD1 selected peptides and QFT-antigen in HIV-infected individuals stratified in 3 CD4⁺ T-cells categories: i) between 0–100/µl, ii) 101–200/µl, and iii) above 200/µl.

P values are reported, *: p<0.05. Among those with active TB, there was a significant difference by χ² for the trend between the categories of the CD4⁺ T-cell counts and the proportion of responders to the IFN-γ-based experimental test (p = 0.032), IP-10-based experimental test (p = 0.048) and for the IFN-γ-response to the TB antigen of the QFT-IT.