Breakthrough in Hantavirus Research Paves Way for Vaccines and Therapies

Hantaviruses, transmitted from rodents to people, have a death rate approaching 40%. Found worldwide, and with no approved vaccines or treatments currently available, they represent a significant concern for future pandemic preparedness. Recent news highlighted the threat of hantaviruses following the death of Betsy Arakawa, wife of actor Gene Hackman, from a hantavirus infection in New Mexico in February 2026.

New Insights into the Andes Virus

Published in the journal Cell, new research offers a crucial first step towards developing much-needed vaccines and antibody therapies for hantaviruses, specifically focusing on the Andes virus, which is endemic to the southwestern U.S. And parts of North and South America .

Mapping the Viral Infection Process

Researchers at The University of Texas at Austin have created a detailed blueprint – the highest resolution yet – of a protein complex the Andes virus uses to infect host cells. This structural map is essential for vaccine development and the creation of antibody therapies. The detailed information allowed the team to create a vaccine candidate that, when tested in mice, prompted their cells to produce neutralizing antibodies against the virus.

“Now that we have a better blueprint of what the virus looks like, we can design effective vaccines and antibody therapies for hantaviruses,” said Jason McLellan, professor of molecular biosciences and the Robert A. Welch Chair in Chemistry at UT Austin, who led the research.

The Gn-Gc Tetramer and Cryo-Electron Microscopy

The research centers on a mushroom-shaped structure called a Gn-Gc tetramer, a surface protein complex of the Andes virus. The team produced virus-like particles, mimicking a real virus without the infectious genome, and used cryo-electron microscopy – a technique that uses an electron beam to create shadows of molecules in a frozen sample – to reconstruct the 3D structures of the tetramers.

A Novel Reconstruction Method

To achieve extremely high resolution, researchers focused on reconstructing shadows from tetramers oriented sideways to the electron beam, effectively borrowing a method typically used for individual proteins. This resulted in structures with a resolution of 2.3 angstroms, a significant improvement over previous models at 12 angstroms.

“People will start to apply this method to many other viruses,” McLellan predicted.

Stabilizing Mutations and AI Assistance

The current structures depict the Gn-Gc tetramer in its pre-infection state, which is crucial for effective vaccines and antibody therapies. The team’s future goal is to identify “stabilizing mutations” that will lock the protein complex in this state. They plan to utilize artificial intelligence tools to assist in identifying these mutations.

Addressing a Global Health Threat

In 2024, the National Institutes of Health (NIH) identified hantaviruses as a high-priority threat due to the lack of effective vaccines or treatments, highlighting their pandemic potential . The research was supported by the NIH’s ReVAMPP program, designed to study dangerous viruses and develop countermeasures. Researchers are simultaneously working on addressing other viruses of concern, such as measles and Nipah virus.

Key Takeaways

• Researchers have created a high-resolution map of a key protein complex used by the Andes virus to infect cells.
• This map is a crucial step towards developing effective vaccines and antibody therapies for hantaviruses.
• A novel reconstruction method using cryo-electron microscopy enabled the high-resolution mapping.
• Artificial intelligence will be used to identify stabilizing mutations for the protein complex.
• The research is part of a broader effort to prepare for future pandemics caused by dangerous viruses.