The Center for Global Health Policy’s “Science Speaks” blog examines a chart, titled “HIV Prevention Options Timeline,” which “was part of AVAC Director Mitchell Warren’s presentation at a Jhpiego-sponsored” event on Thursday, titled “The Present and the Future of HIV Prevention.” According to the blog the “chart of clinical research trials seeking ways to control HIV transmission makes for an impressive display of tenacity, with interrupted trials, ongoing trials, trials that led to other trials, and new trials in their earliest stages. It includes trials of microbicides, vaccines, antiretroviral drug-based approaches and all of that in different combinations” (Barton, 4/26).