The order in which HIV breaches barriers and affects immunity is
A. ingestion, entering the circulation, entering helper T cells.
B. crossing the mucosal barrier, entering macrophages, then B cells, then natural killer cells.
C. crossing the mucosal barrier, entering macrophages, entering helper T cells, then cytotoxic T cells.
D. inhalation, entering the circulation, entering helper T cells.
Answer: C
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