Skip to Content

The second person ever has been cleared of HIV after a stem-cell treatment

The unnamed man in London is now free of HIV, although it is too early to say he has been “cured.”

The details: The patient received a stem-cell transplant from a donor with a rare genetic mutation that causes HIV resistance. Specifically, the donor had two copies of a certain version of the CCR5 gene. The procedure took place almost three years ago. Although the patient has been in remission and has not taken any antiretroviral drugs for 18 months, his doctors still hesitate to claim he’s been “cured.” Originally, the aim was to treat cancer—the patient was diagnosed with Hodgkin’s lymphoma in 2012—rather than HIV.

Previous patient: This new study, reported in Nature, demonstrates that the previous case of Timothy Brown (a.k.a. the “Berlin patient”), who was cured of HIV in 2007 through a similar treatment, was not an anomaly.

CRISPR babies: The treatment suggests targeting CCR5 to make people HIV resistant has promise. The approach links to another major story, which emerged in November: the twin girls Lulu and Nana in China, who had their genes edited using the CRISPR technique. Chinese scientist He Jiankui altered their embryos to remove the gene in the hopes of making them resistant to several diseases, including HIV. It is too early to say if this effort was successful.

Impact: Inevitably there’s huge excitement about the case, given the devastating impact of HIV and AIDS. About 37 million people worldwide are infected with HIV or AIDS, and the virus has killed about 39 million people since it emerged in the 1980s, according to the World Health Organization. The new case is a long way from a cure, but it offers a tantalizing glimpse at how we might get to one in future.

Sign up here to our daily newsletter The Download to get your dose of the latest must-read news from the world of emerging tech.

Deep Dive


This startup wants to copy you into an embryo for organ harvesting

With plans to create realistic synthetic embryos, grown in jars, Renewal Bio is on a journey to the horizon of science and ethics.

This nanoparticle could be the key to a universal covid vaccine

Ending the covid pandemic might well require a vaccine that protects against any new strains. Researchers may have found a strategy that will work.

How do strong muscles keep your brain healthy?

There’s a robust molecular language being spoken between your muscles and your brain.

The quest to show that biological sex matters in the immune system

A handful of immunologists are pushing the field to take attributes such as sex chromosomes, sex hormones, and reproductive tissues into account.

Stay connected

Illustration by Rose Wong

Get the latest updates from
MIT Technology Review

Discover special offers, top stories, upcoming events, and more.

Thank you for submitting your email!

Explore more newsletters

It looks like something went wrong.

We’re having trouble saving your preferences. Try refreshing this page and updating them one more time. If you continue to get this message, reach out to us at with a list of newsletters you’d like to receive.