Mycobacterium vaccae (SRL172) immunotherapy as an adjunct to standard antituberculosis treatment in HIV-infected adults with pulmonary tuberculosis: a randomised placebo-controlled trial

Lancet. 2002 Oct 5;360(9339):1050-5. doi: 10.1016/S0140-6736(02)11141-X.


Background: Mortality rates of HIV-infected patients treated for tuberculosis remain high. This study aimed to assess the effect on mortality of immunotherapy with single-dose SRL172 added to standard antituberculosis chemotherapy in such patients.

Methods: The double-blind trial enrolled 1229 patients aged 18-60 years, who had never received antiretroviral treatment and who presented with newly diagnosed, sputum-smear-positive pulmonary tuberculosis to referral centres in Lusaka, Zambia, and Karonga, Malawi. Both HIV-positive and HIV-negative patients were enrolled, to avoid stigmatisation. Participants were randomly assigned a single injection of SRL172 or matching placebo within 2 weeks of starting 8 months of antituberculosis chemotherapy and followed up for at least 12 months. The primary endpoint was time to death in the HIV-infected population. Analyses were based on 760 HIV-positive patients after exclusion of 84 patients with errors in storage of the injection, no bacteriological confirmation, or no HIV result.

Findings: Of 760 HIV-infected patients, 374 received SRL172 and 386 received placebo. SRL172 did not cause any serious adverse events. The follow-up rate was 88% at 12 months in both groups. Of the HIV-positive patients, 109 (19.5 per 100 person-years) of 372 assigned SRL172 and 107 (19.3 per 100 person-years) of 386 assigned placebo died. In the Cox's regression analysis, stratified by centre, the hazard ratio of deaths (SRL172/placebo) was 1.03 (95% CI 0.79-1.35). There was no evidence of benefit to the group assigned SRL172.

Interpretation: Immunotherapy with single-dose SRL172 as an adjunct to standard antituberculosis treatment in HIV-positive adults with pulmonary tuberculosis had no significant effect on survival or bacteriological outcome, though the treatment was safe and well tolerated.

Publication types

  • Clinical Trial
  • Multicenter Study
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • AIDS-Related Opportunistic Infections / diagnosis
  • AIDS-Related Opportunistic Infections / drug therapy*
  • AIDS-Related Opportunistic Infections / microbiology
  • AIDS-Related Opportunistic Infections / mortality
  • Adjuvants, Immunologic / therapeutic use*
  • Adult
  • Antitubercular Agents / therapeutic use*
  • Bacterial Vaccines / therapeutic use*
  • Double-Blind Method
  • Female
  • Follow-Up Studies
  • Humans
  • Immunotherapy / methods*
  • Injections, Intradermal
  • Malawi / epidemiology
  • Male
  • Placebos
  • Proportional Hazards Models
  • Sputum / microbiology
  • Survival Analysis
  • Treatment Outcome
  • Tuberculosis, Pulmonary / diagnosis
  • Tuberculosis, Pulmonary / drug therapy*
  • Tuberculosis, Pulmonary / microbiology
  • Tuberculosis, Pulmonary / mortality
  • Zambia / epidemiology


  • Adjuvants, Immunologic
  • Antitubercular Agents
  • Bacterial Vaccines
  • Placebos
  • SRL172