Lisandro writes "German scientists at the University of Ulm have identified a natural ingredient of human blood that prevents the HIV-1 virus from from infecting immune cells and multiplying. The molecule, which they call virus-inhibitory peptide (VIRIP), promises new types of effective treatment for HIV in the future. 'Tweaks to its amino acid components boosted its anti-HIV potency by two orders of magnitude. Tests also showed that some derivatives of the molecule are highly stable in human blood plasma, and non-toxic even at very high concentrations. A synthetic version of VIRIP also proved effective at blocking HIV, excluding the possibility that some other factor was responsible. VIRIP targets a sugar molecule which HIV uses to infect a host cell. '"