HVTN 702 clinical trial of an HIV vaccine stopped 
The United States National Institutes of Health has announced that its HVTN 702 clinical trial of an HIV vaccine has been stopped. While no safety concerns were found during the trial, the independent data and safety monitoring board found that the vaccine was ineffective in preventing HIV transmission.
NIH: www.nih.gov/news-events/news-releases/experimental-hiv-vaccine-regimen-ineffective-preventing-hiv
Science: www.sciencemag.org/news/2020/02/another-hiv-vaccine-strategy-fails-large-scale-study