Abstract
The worldwide effort to produce a vaccine against AIDS continues to disregard the fact that even human immunodeficiency virus (HIV)-specific neutralizing antibodies and cell-mediated immunity are ineffective against virus within cells without viral antigens on the cell membrane--and that much of HIV infection is transmitted in this manner. According to a recent report, a simian immunodeficiency virus vaccine that protected monkeys against an intravenous challenge with cell-free virus was, as predicted, ineffective against an intravenous challenge with the same amount of virus in infected cells. Moreover, antibody and HIV have been found to coexist in cell-free plasma from asymptomatic and symptomatic patients. Excluding direct introduction of HIV into the blood-stream, the most common and efficient form of transmission of HIV infection is by receptive anal intercourse, and semen contains large numbers of infected cells per milliliter. Recent reports showing that colorectal cells can be persistently infected by HIV and that HIV RNA and cDNA are present in the cells of the colon of dead AIDS patients indicate that either cell-free or intracellular HIV has the capacity to multiply at the portal of entry in the colorectal area without interference from neutralizing antibodies. The available data provide no basis for testing any HIV vaccine in human beings either before or after infection. The main challenge is to find a way to kill cells with chromosomally integrated HIV cDNA without harming normal cells, perhaps by identifying repressor proteins that might be produced by the cells with integrated HIV cDNA and thus could become specific targets for cell-killing drugs.
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