Experimental Gel To Protect Women From HIV Infection Not Effective, Study Finds

This is not an HIV site, still this article is instructive.

"The experimental microbicide Carraguard, a seaweed-based gel that blocked HIV infection of cells in lab tests is safe but does not provide women with protection against HIV infection, according to results from clinical trials conducted in three locations in South Africa, the Seattle Post-Intelligencer reports (Paulson, Seattle Post-Intelligencer, 2/18)."

What works in the lab cannot be presumed to work in the real world.

Beware of lab data.