First AI-Designed Virus Given to a Patient in Medical Milestone

Doctors have treated a patient with viruses designed by artificial intelligence for the first time, marking a milestone in the search for new weapons against infections that no longer respond to antibiotics.

The experimental treatment was developed by San Francisco-based company Radical Numerics, whose AI model, Omnii-1, designed a cocktail of bacteriophages — viruses that attack bacteria but leave human cells untouched. It was given to a patient under a physician-led compassionate-use programme authorised by the United States Food and Drug Administration (FDA), after standard antibiotics and existing phage treatments had failed.

FAKTA

• What happened: the first clinical use of AI-designed bacteriophages in a human patient.
• Who: Radical Numerics, a San Francisco-based AI company, using its model Omnii-1.
• The patient: a person with an antibiotic-resistant E. coli infection, as reported by The New York Times.
• How it was tested: the phage cocktail was tried against bacteria taken from the patient in the laboratory, where it eliminated the resistant sample, before it was administered.
• Status: the report has not been peer-reviewed, and the treatment outcome has not been disclosed; a single case cannot prove safety or effectiveness.

How the AI designs its viruses

Traditional phage therapy means hunting through nature for a virus that attacks a patient’s exact bacterial strain. Omnii-1 takes a different route: it is a multimodal genome language model trained on measured interactions between phages and bacteria, and it edits parts of existing phages so they recognise and attach to the bacteria causing the infection.

In company tests against 37 previously unseen E. coli strains, Omnii-1 identified active phages for 91.4 percent of eligible strains using just two phages, outperforming two specialised prediction systems. Radical Numerics says the approach could cut the design process to a few days, allowing doctors to respond far more quickly to serious infections.

Why it matters — and why caution is needed

Antibiotic resistance is one of the greatest threats facing modern medicine. A 2024 study published in The Lancet projected that bacterial antimicrobial resistance could directly cause 39.1 million deaths worldwide between 2025 and 2050. When antibiotics fail, doctors are left with few options, and phage therapy is among the most promising alternatives — but matching the right phage to each patient has so far been slow and difficult.

Caution is essential. The company’s report has not been published in a scientific journal or independently peer-reviewed, and Radical Numerics has not disclosed the patient’s detailed diagnosis, clinical course or whether the infection was cleared, citing patient privacy. Doctors will need months of monitoring to confirm the infection does not return. Earlier AI phage research, including work by Stanford University and the Arc Institute with a model called Evo 2, had only ever destroyed bacteria in laboratory experiments — never before in a human patient.

If further studies confirm the approach, doctors could one day design personalised treatments within days rather than weeks. For now, this first patient is a proof of possibility, not yet a proven cure.