90-Second Read: Pan-Arenavirus Vaccine Research May Inform Hantavirus Efforts

This research comes as scientists are working to stop the spread of Andes Hantavirus, which recently caused a deadly outbreak among cruise ship passengers and crewmembers. Hantaviruses and arenaviruses are very similar in how they spread (between rodents and humans) and how they work (both are single-strand, segmented RNA viruses). Sette says the new study shows how scientists can analyze T cells to devise life-saving vaccine strategies against arenaviruses, Hantaviruses, paramyxoviruses (such as measles), togaviruses (such as Chikungunya), and many other threats. Learn how T cell epitope mapping revealed shared arenavirus targets, supporting development of a pan-arenavirus vaccine strategy for future preparedness.

In May 2026, an outbreak of the Andes strain of Hantavirus sickened 14 and killed three people on an international cruise ship. Also like arenaviruses, Hantaviruses are split into Old World and New World species. Importantly, both arenaviruses and Hantaviruses are known as single-strand, segmented RNA viruses, which means they carry similar genetic instructions. About 45,000 years ago, arenavirus evolution diverged, leading to marked differences between "Old World" arenaviruses (in European, African, and Asian countries) and "New World" arenaviruses (in the Americas).

Stay up to date on the topics that matter to you Scientists at La Jolla Institute for Immunology (LJI) have discovered that combining key vaccine ingredients could give the body the tools it needs to fight the entire family of arenaviruses with a single vaccine. This "pan-arenavirus" vaccine approach may protect against life-threatening infections from Lassa virus, Junin virus, and many other arenaviruses with pandemic potential. In their Cell Reports Medicine paper, the researchers show that T cells can spot the family resemblance between different species of arenaviruses. According to the California Department of Public Health, risk of infection is low, but people should take steps to avoid rodent dropping and contaminated areas.

Recently, attention has turned to the risk of person-to-person Hantavirus transmission. The Andes Hantavirus, which recently spread on the cruise ship MV Hondius, appears to have the unique ability to spread from human to human. Lassa virus and Junin virus aren't part of daily life here in the United States, but Hantaviruses are becoming more and more of a local concern.