How Does PrEP Block HIV?
* { padding: 0; margin: 0; overflow: hidden } html, body{ height: 100%; } img, span{ position: absolute; width: 100%; top: 0; bottom: 0; margin: auto } span { background: url('/images/widgets/youtube-play-button.png') no-repeat center; height: 5rem; text-align: center; color: white; } " frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen How does PrEP work? When HIV infects a T cell, it has an ability to take over the replication mechanisms within creating copies of itself.