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Protease inhibitors are a class of antiviral drugs that are commonly used to treat HIV. Scientists have designed a new delivery system for these drugs that, when coupled with another investigational drug, rid immune cells of HIV and kept the virus in check for long periods. While current HIV treatments involve pills that are taken daily, the new regimens’ long-lasting effects suggest that HIV treatment could be administered perhaps once or twice per year.
http://www.sciencedaily.com/releases/2015/10/151019123151.htm