A cluster randomized trial of provider-initiated (Opt-out) HIV counseling and testing of tuberculosis patients in South Africa

The objective was to determine whether implementation of provider-initiated human immunodeficiency virus (HIV) counseling would increase the proportion of tuberculosis (TB) patients who received HIV counseling and testing. The design used was a cluster-randomized trial with clinic as the unit of randomization. The setting was twenty medium-sized primary care TB clinics in the Nelson Mandela Metropolitan Municipality Port Elizabeth Eastern Cape Province South Africa. The subjects were a total of 754 adults (18 years and older) newly registered as TB patients in the 20 study clinics. The intervention was the implementation of provider-initiated HIV counseling and testing. The main outcome measures were percentage of TB patients HIV counseled and tested; percentage of patients with HIV test positive and percentage of those who received cotrimoxazole and who were referred for HIV care. A total of 754 adults newly registered as TB patients were enrolled. In clinics randomly assigned to implement provider-initiated HIV counseling and testing 20.7% (73/352) patients were counseled versus 7.7% (31/402) in the control clinics (P = 0.011) and 20.2% (n = 71) versus 6.5% (n = 26) underwent HIV testing (P = 0.009). Of those patients counseled 97% in the intervention clinics accepted testing versus 79% in control clinics (P = 0.12). The proportion of patients identified as HIV infected in intervention clinics was 8.5% versus 2.5% in control clinics (P = 0.044). Fewer than 40% of patients with a positive HIV test were prescribed cotrimoxazole or referred for HIV care in either study arm. Provider-initiated HIV counseling significantly increased the proportion of adult TB patients who received HIV counseling and testing but the magnitude of the effect was small. Additional interventions to optimize HIV testing for TB patients urgently need to be evaluated. (authors)