That man, Timothy Ray Brown (known only as the "Berlin patient" at the time), received a similar bone marrow transplant which cured him of the disease. Both Brown and the London patient received cancer-related bone marrow transplants from donors with a mutation in the CCR5 protein.
The important point here is that it had been assumed that there might be something special about the Berlin patient, but now "we know it is reproducible", said Hütter, who was not involved in the London patient's treatment.
Dr Gupta, a virologist at University of London, described the cure as "remission", a term normally used with cancer patients to mean that one is not cancer free, as the cancer cells are still in the body but inactive.
The study will also be presented at an HIV conference in Seattle. The American was afflicted with acute myeloid leukemia and received a stem cell transplant from a donor with the same CCR5 delta 32 gene.
Nearly 1 million people die each year from HIV-related causes and the only current treatment available is for the affected to take antiretroviral drugs for their entire lives.
"Coming 10 years after the successful report of the Berlin Patient, this new case confirms that bone marrow transplantation from a CCR5-negative donor can eliminate residual virus and stop any traces of virus from rebounding", she said.
He is the second known person to experience sustained remission from HIV; the first man, Timothy Ray Brown, was cured 12 years ago. Then, in 2012 the unidentified patient was diagnosed with a cancer, Hodgkin lymphoma. This makes it a tricky and unfeasible option as a treatment for other HIV-positive patients in the near future.
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Professor Gupta added: "Continuing our research, we need to understand if we could knock out this receptor in people with HIV, which may be possible with gene therapy". He also naturally had one Δ32 copy, and when similar efforts failed with other patients, there was speculation this, or some other rare feature of Brown's case, was required for success.
Mr Brown said he would like to meet the London patient and would encourage him to go public because "it's been very useful for science and for giving hope to HIV-positive people, to people living with HIV".
Millions of people infected with HIV around the world keep the disease in check with so-called antiretroviral therapy (ARV), but the treatment does not rid patients of the virus.
Possibly. The London patient's immune system is now created to block HIV's most common path into cells, using the CCR5 receptor.
This is the second time a person has been cleared of HIV following a bone marrow transplant from a donor with this genetic mutation.
The study's lead author, Professor Ravindra Gupta, said: "Finding a way to eliminate the virus entirely is an urgent global priority, but is particularly hard because the virus integrates into the white blood cells of its host". "We can't detect anything", said Ravindra Gupta, a professor and HIV biologist who co-led a team of doctors treating the man.