Loreen Willenberg: HIV Research Pioneer & Community Advocate Dies
- Loreen Willenberg, known as the “San Francisco Patient,” a woman who lived with HIV for decades without antiretroviral therapy and was believed by some researchers to be cured...
- Willenberg was diagnosed with HIV in 1992, but unlike most people living with the virus, her immune system naturally kept the virus undetectable and her immune cell count...
- According to amfAR, Willenberg’s willingness to share her experiences and collaborate with researchers significantly expanded the boundaries of HIV cure research.
Loreen Willenberg, known as the “San Francisco Patient,” a woman who lived with HIV for decades without antiretroviral therapy and was believed by some researchers to be cured of the virus, has died. She was 66. Willenberg’s death earlier this week was announced by amfAR, The Foundation for AIDS Research, on April 10, 2026.
Willenberg was diagnosed with HIV in 1992, but unlike most people living with the virus, her immune system naturally kept the virus undetectable and her immune cell count high without medication. She became the first person to publicly identify as an “exceptional elite controller” in 2006, and subsequently founded the Zephyr Foundation to connect others with similar abilities.
A Pioneer in HIV Cure Research
According to amfAR, Willenberg’s willingness to share her experiences and collaborate with researchers significantly expanded the boundaries of HIV cure research. She participated in multiple clinical studies over more than two decades, providing invaluable insights into the role of the immune system in controlling the virus.
In 2020, researchers Drs. Xu Yu and Matthias Lichterfeld, of the Ragon Institute of MGH, MIT, and Harvard, announced that they were unable to find any intact HIV in her body after searching over a billion cells. Dr. Yu recently stated that she believes Willenberg was cured of HIV.
“I still worry about the 40 million-plus people [living with HIV]…individuals who need to be on the medications,” Willenberg said of her dedicated participation in clinical research. “I want to help… [and] I’m being given an opportunity to help in a really big way. And that’s why I walk in gratitude….”
Loreen Willenberg
The Well Project and the Women’s Research Initiative on HIV/AIDS (WRI) also mourned her loss, noting her participation in a WRI meeting last spring focused on women and HIV cure research. They described her as a gift and a bright light to those who knew her.
Donating Her Body to Science
In a final act of generosity, Willenberg donated her body to the Last Gift study, a research initiative that allows scientists to examine the body of individuals who controlled HIV without medication to understand where the virus hides within the body. This donation is expected to provide crucial information for ongoing efforts to find a cure for HIV.
Willenberg’s case is particularly significant because exceptional elite controllers are rare. These individuals are able to control HIV naturally, without the need for antiretroviral therapy, offering a unique opportunity to study the immune responses that can suppress the virus.
Her dedication to research and advocacy has left a lasting impact on the HIV/AIDS community, and her contributions will continue to inform the search for a cure for years to come. The Well Project stated that she was an elite controller, a term she personally disliked, and that she participated in clinical trials for decades to help researchers understand how she was able to eliminate HIV without medical intervention.
Vilma Vega M.D., AAHIVS, commented on a LinkedIn post about Willenberg’s passing, stating, “Her life was a gift!”