http://www.medicalnewstoday.com/articles/289477.php

If a person contracts multiple strains of HIV – typically by engaging in unprotected sex with multiple infected partners – then these strains can recombine into a new variant of HIV within the host. The new Cuban variant of HIV is one such recombinant version of the virus.
HIV anchors itself to co-receptors – proteins on the membranes of cells – before the virus is able to penetrate the cell. The first co-receptor that HIV anchors to is known…
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