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<p>a number of mechanisms, including <a href="page.php?w=pyroptosis">pyroptosis</a> of abortively infected T cells, <a href="page.php?w=apoptosis">apoptosis</a> of uninfected bystander cells, direct viral killing of infected cells, and killing of infected CD4<SUP>+</sup> T cells by <a href="page.php?w=CD8_cytotoxic_lymphocyte">CD8<SUP>+</sup> cytotoxic lymphocyte</a>s that recognize infected cells. When CD4<SUP>+</sup> T cell numbers decline below a critical level, <a href="page.php?w=cell-mediated_immunity">cell-mediated immunity</a> is lost, and</p><p>
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