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The development of an HIV vaccine presents several complex issues, both scientific and social, which have affected progress in combating the epidemic. One major scientific challenge is the high genetic variability of the HIV virus. HIV mutates rapidly, creating multiple subtypes and strains, which makes it difficult to develop a single vaccine capable of providing broad protection. ______ ___ __________ ______ ________ ______ _________ _______ ___ ___ _________.
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