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<p>Following a structural change in another viral protein (<a href="page.php?w=gp41">gp41</a>), HIV inserts a <a href="page.php?w=fusion_peptide">fusion peptide</a> into the host cell that allows the outer membrane of the virus to fuse with the <a href="page.php?w=cell_membrane">cell membrane</a>.</p>

<p><big> HIV pathology </big></p>
<p>HIV infection leads to a progressive reduction in the number of <a href="page.php?w=T_helper_cells">T cells expressing CD4</a>. Medical professionals refer to the CD4 count to decide when to begin treatment during HIV infection,</p><p>
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