Rising Hantavirus Concerns in the U.S.

A suspected case of hantavirus in Illinois serves as a reminder that this virus remains present in the U.S. While the MV Hondius cruise ship outbreak is unrelated, it highlights the potential threat of hantavirus worldwide.

In North America, the prevalent strain is the Sin Nombre virus, which leads to a serious lung syndrome. Transmission happens when airborne particles from infected rodents’ urine, saliva, or feces are inhaled.

Current Research on Hantavirus

Arizona records one of the highest infection rates in the U.S. Recent studies identify Virginia, Colorado, and Texas as new hotspots. Virginia Tech researchers note 15 rodent species carry hantavirus, identifying six new potential hosts in the eastern U.S.

“We see human cases in places like New Mexico, but rodent infections are most prominent in Virginia,” said Luis Escobar of Virginia Tech.

Escobar’s research followed the COVID-19 pandemic, examining how viruses transition from animals to humans. With some strains exhibiting a 50% mortality rate, hantavirus is considered a potential pandemic threat.

Nonetheless, health authorities from the World Health Organization and the CDC clarify there is no evidence the cruise outbreak is the start of a pandemic. Only the Andes strain is known for human-to-human transmission. Seasonal increases in other strains are expected.

Hantavirus Cases and Studies

Escobar’s team tested over 14,000 rodent blood samples across the U.S. from 2014-2019. Findings were presented to CDC scientists, highlighting emerging zoonotic threats like hantavirus.

CDC records 890 hantavirus cases since 1993, mostly in the western U.S., with significant cases reported in Colorado, New Mexico, Arizona, and California. However, Virginia has documented only a few cases.

Approximately 35% of hantavirus cases in the U.S. have resulted in death. Public attention on hantavirus rose in 2025 following deaths linked to the virus in New Mexico and California.

Environmental Factors Affecting Hantavirus Spread

Research from Los Alamos National Laboratory shows that arid regions, primarily in the West, face higher infection risks due to dry air and high temperatures facilitating airborne excrement.

“The virus can persist for weeks in the environment,” said Morgan Gorris. “Without rainfall, it becomes airborne,” raising risks.

Increased encroachment on rodent habitats raises stress, leading to greater virus shedding.

Prevention Measures

The Illinois Department of Public Health investigates a case linked to exposure during cleanup. The CDC offers guidelines for minimizing hantavirus risks:

• Ventilate areas by opening windows and doors for 30 minutes.
• Wear rubber or plastic gloves; a mask is recommended by some experts.
• Avoid vacuuming or sweeping, as this may aerosolize droplets.
• Disinfect areas with rodent urine and droppings using a bleach solution (1.5 cups bleach per gallon of water) or a disinfectant spray.
• Let disinfected areas soak for five minutes before cleanup.
• Dispose of paper towels in covered garbage after use.
• Disinfect all hard surfaces thoroughly.
• Wash gloved hands, remove gloves, then wash hands again with soap and water.