Eleven years to the day after a stem cell transplant cleared HIV from his body, Thomas Kahlert stood up in Berlin under his own name.

Until now he was known only as the “second Berlin patient.” On Wednesday, October 14, the Charité, Berlin’s university hospital, opened a new HIV cure research centre, and its clinical study centre carries his name. “Sehr gut,” he told reporters when asked how he’s doing: very well (Tagesspiegel).

The short version

  • Who: Thomas Kahlert, 62, who has worked at the Charité for 38 years, is one of only 13 people worldwide considered cured of HIV (queer.de; Charité).
  • What’s new: The Charité has opened the Berlin Center for HIV Cure (BeCURE), with a clinical study centre named the Brown-Kahlert-Studienzentrum after Berlin’s two cured patients.
  • The goal: A cure or lasting remission that doesn’t require a risky stem cell transplant. First antibody studies have already started.
  • The reality check: Kahlert’s route to a cure began with leukaemia. Doctors are clear it isn’t a treatment for the roughly 41 million people living with HIV.

How Kahlert got here

Kahlert’s story, as he told it to queer.de, runs like this:

  • 2009: HIV is found during a routine check-up.
  • 2015: He’s diagnosed with acute myeloid leukaemia, a blood cancer. “That was a really terrible moment,” he said (our translation).
  • October 14, 2015: After chemotherapy, he receives stem cells, and with them a whole new immune system, from a healthy female donor.
  • Three years later: He stops his HIV medication himself, against his doctor’s advice. “Ich hab’s einfach gefühlt,” he said: “I just felt it.” Since then no renewed viral activity has been found.

His case was made public in 2024, but his name was kept private until now.

Why his case surprised scientists

Berlin has been here before. In 2008 the Charité showed that Timothy Ray Brown, the original “Berlin patient,” had been cured of HIV after a stem cell transplant for leukaemia. He was the first person in the world known to be cured, and his case founded the whole field of HIV cure research, the Charité says.

Brown’s donor carried two copies of a rare mutation, CCR5-delta 32, that blocks the doorway HIV uses to get into immune cells. Kahlert’s donor didn’t. She carried one normal copy and one mutated copy, which doesn’t make someone resistant to HIV (queer.de). No fully resistant donor could be found for him.

That’s the big deal. The Charité says Kahlert’s case shows the new immune system doesn’t have to be HIV-resistant for a cure to happen. Early analyses suggest his new immune system cleared out the virus’s hiding places, with antibodies that flag infected cells for the body’s killer cells appearing to play a key role.

What BeCURE will actually do

The Charité says the centre, on its Virchow campus in Berlin-Wedding, will:

  • Combine lab research with clinical trials across infectious diseases, virology, immunology, haematology, obstetrics and liver medicine.
  • Test antibody, immune, cell and gene therapies designed to wipe out the virus or keep it permanently under control.
  • Run social science research alongside the medicine.
  • Give people living with HIV a real say through a Community Collaboration Board of people living with HIV or who know their needs.
  • Act as a contact point for people in Berlin and the region who want to join trials of new therapies.
  • Study hepatitis B too, which affects around 240 million people worldwide.

“Our goal at BeCURE is to make an HIV cure or lasting remission into real treatment options,” said director Christian Gaebler (our translation).

Why it isn’t a cure you can ask your doctor for

Gaebler was blunt about the limits: a stem cell transplant is far too risky for people who can already manage HIV well with medication, queer.de reports. It’s used for people who need it to survive cancer, not as an HIV treatment. The point of BeCURE is to learn from cases like Kahlert’s and find safer routes that could reach many more people.

That’s also Kahlert’s own wish, he told queer.de: that what doctors learned from his body helps research and reaches countries where not everyone has access to modern medicine.

Why it matters

HIV treatment today works brilliantly, but it’s for life. Without it the virus usually comes back within weeks, and people living with HIV still face higher risks of heart and metabolic disease, plus stigma that hasn’t gone away, the Charité notes. In Berlin alone, around 18,000 people live with HIV, according to Robert Koch Institute figures cited by queer.de.

A cure that works for everyone is still years of research away. But a city that cured the first person in the world, then a second, has just built a whole centre around the question of who’s next. And the man in the middle of the story put his name to it.

If you haven’t tested in a while, this is your nudge: testing is quick, and treatment works.