On-off switch for HIV

By Cristina Serra A STRAIN of HIV that can only replicate in the presence of a specific drug has been developed by researchers in the Netherlands. They say the virus could be the basis for a safe live HIV vaccine. Many vaccines are based on weakened viruses that can replicate and provoke an immune response, but don’t cause disease. But so far HIV has defeated all efforts to create such a “live attenuated vaccine”. Whenever researchers weaken the virus by deleting or altering its genes,
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