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A red ribbon is hung from the North Portico of the White House, Nov. 30, 2012, to mark World AIDS Day on Dec. 1.

A red ribbon is hung from the North Portico of the White House, Nov. 30, 2012, to mark World AIDS Day on Dec. 1.

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Patients HIV-free for now after transplant

Experts say it's too early to know if the two are cured

Two more HIV patients have no signs of the virus in their blood following bone marrow transplants, according to the Boston researchers who treated them.