Researchers discovered a large amount of potentially active HIV hiding in infected immune system cells of patients, which could make the eradication of the virus more difficult than previously thought, according to a study in the journal Cell. Determining the size of the reservoir is important for the potential effectiveness of a strategy known as "shock and kill," in which dormant HIV is activated and treated with antiretroviral drugs. Though the approach might still lead to a rebound of the infection, this discovery could still boost support for alternative approaches to a cure.

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