What are the different types of vaccine?
There are three main types of vaccines that are being studied for the prevention of HIV infection and AIDS: • Subunit vaccines, also known as “component” or “protein” vaccines, contain only individual parts of HIV, rather than the whole virus. Instead of collecting these parts from the virus itself, the HIV subunits are made in the laboratory using genetic engineering techniques. These man-made subunits alone—without the rest of the virus—can prompt the body to produce an anti-HIV immune response, although that response may be too weak to actually protect against future HIV infection. • Recombinant vector vaccines take advantage of non-HIV viruses that either don’t cause disease in humans or have been deliberately weakened so that they can’t cause disease. These weakened (attenuated) viruses are used as vectors, or carriers, to deliver copies of HIV genes into the cells of the body. Once inside cells, the body uses the instructions carried in the copies of HIV genes to produce HIV prot
