A few people with
HIV are described as nonprogressors. These people have HIV that does not progress
to more severe symptoms or disease, but they can still spread HIV. Most nonprogressors:
Have lived with the infection for 10 to 15 years
and remained healthy.
Do not have declining CD4+ cell
Have a very low level of HIV in their blood.
A small number of people never become infected with HIV despite years
of exposure to the virus. For example, they may have repeated, unprotected sex
with an infected person. These people are said to be HIV-resistant. These people are never infected, so they can't spread HIV.
Studies are under way to determine why some people either don't
become infected with HIV or, if they do, why they don't develop symptoms or
lose CD4+ cells. Research has shown that:
Some people's CD4+ cells are relatively resistant
to HIV. If HIV cannot attach itself to CD4+ cells, it cannot destroy
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