To clarify this point, there have been a very small handful of people who have been "functionally cured" of HIV, but none of them were cured through a comprehensive transfusion of HIV-positive blood.
Specifically, "functionally cured" = going from having a confirmed, established infection to having no detectable trace of the virus. It is believed that the virus still remains in the body (thanks, in part, due to the fact that HIV integrates itself into the host's genome), but no longer replicates. And "very small handful of people" = about fourteen (as of March 2013).
Typically these lucky few become functionally cured because of aggressive anti-retroviral therapy that comes immediately after infection and diagnosis. I.e., these are among the rare few who know when they've become infected (from a needle stick, or a rape, or exposure to blood in an accident, etc.) and can receive immediate medical attention.
A well-known example is the "Miracle in Mississippi", an infant who become HIV-infected from his/her mother (i.e., perinatal transmission). The child received heavy anti-retroviral therapy within days of birth, and remains clear of the infection 1-2 years later.
An outlier case (and probably the one you are thinking of, as it's the closest thing to a "blood swap" that I can imagine) is the "Berlin Patient" (a.k.a. Timothy Brown), an HIV-positive American man with leukemia (then living in Berlin) who received a bone-marrow transplant from a donor with an HIV-resistant genetic factor (a.k.a. "CCR5-Δ32"), which foiled the virus's attempt to persist as an infection. Brown's viral load remains undetectable 6+ years later, even after being off anti-retroviral medication. This medical process has been attempted several times since (with different HIV-positive cancer patients), but none of them have been successful.
(So for the record, there is no space-age medical procedure where one's blood is removed and replaced with HIV-negative blood (or any other kind of blood for that matter). Such a guaranteed 100% blood swap would be medically impossible to accomplish, and even if it were possible, given the fact that HIV lives in more places than the blood, such a procedure wouldn't serve as a cure. HIV is frequently, and erroneously, regarded as a disease of the blood. The cells that are infected with HIV are actually part of the immune system, and while these cells are found in (and transmitted through) the blood, HIV tends to go where these cells go, which is basically everywhere within the human body. HIV establishes "viral reservoirs" in lymphatic tissues, gut tissues, various mucosa, the bone marrow, the genital tract, even the brain, etc., so any attempt to eradicate HIV needs to deal with each and every one of these reservoirs. A hefty blood transfusion ain't gonna cut it.)
Magic Johnson is still HIV-positive, and his longevity has been very impressive, considering the era from when he became infected. I'm presuming that his wealth afforded him the best-available health care from the beginning, and he probably had an early diagnosis.
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