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The development of an HIV vaccine faces multiple scientific, social, and ethical challenges. One of the primary scientific obstacles is the high genetic variability of the HIV virus. HIV mutates rapidly, producing numerous strains, which makes it difficult to create a single vaccine that can provide broad and long-lasting protection. Unlike other viruses, HIV targets the immune system itself, particularly the __________ _____ ___ ____ ________ _______ ______ ________.
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