Hantavirus Vs Coronavirus- What You Need to Know

In May 2026, the deaths of three passengers aboard the MV Hondius cruise ship due to hantavirus infection triggered global concern. As countries worked to repatriate quarantined passengers, many began asking the same question: could this become another COVID-19 crisis?

According to health experts, the answer is no — although the comparison deserves closer examination.

While both hantavirus and COVID-19 can severely affect the lungs, they differ greatly in transmission, spread, and overall pandemic potential. Here is a simplified comparison between the two illnesses.

What Are These Viruses?

Hantavirus is not a newly discovered disease. It is a rare but serious illness caused by hantaviruses, members of the Bunyavirus family that are mainly carried by rodents. More than 30 hantavirus species are known worldwide. The strain linked to the MV Hondius outbreak — the Andes virus — is especially significant because, according to the WHO, it is the only hantavirus known to allow limited human-to-human transmission through prolonged and close contact.

COVID-19, caused by the SARS-CoV-2 coronavirus, is a highly contagious respiratory disease that spread globally during the pandemic. One of its most dangerous characteristics is its ability to transmit easily between people, including from individuals who show only mild symptoms or none at all.

How They Spread: The Biggest Difference

The key distinction between these viruses lies in transmission.

Hantavirus primarily spreads from rodents to humans. Infection usually occurs when people inhale particles contaminated with rodent urine, saliva, or droppings, especially in enclosed or poorly ventilated areas. Even with the Andes strain, human-to-human spread is considered extremely rare and typically requires prolonged close contact or overcrowded conditions.

COVID-19, on the other hand, spreads efficiently through respiratory droplets released when an infected person coughs, sneezes, talks, or breathes. Because people without obvious symptoms can also spread the virus, containing transmission becomes far more difficult.

This difference is the main reason hantavirus has never developed into a global pandemic despite its severity.

Symptoms: Similar Beginnings, Different Outcomes

Both illnesses may initially resemble the flu, but their progression can differ dramatically.

Hantavirus infection often develops in two phases. Early signs include fever, severe fatigue, and muscle pain. In more serious cases, symptoms rapidly worsen into respiratory distress and hantavirus cardiopulmonary syndrome (HCPS), which can lead to pulmonary leakage, breathing failure, and life-threatening complications.

COVID-19 also causes respiratory symptoms such as fever, cough, body aches, fatigue, breathing difficulty, and sometimes loss of smell or taste. However, the majority of COVID-19 infections remain mild or moderate, unlike severe hantavirus pulmonary syndrome cases.

Mortality: Hantavirus Is Far More Deadly

Hantavirus has a significantly higher fatality rate. Severe forms such as hantavirus pulmonary syndrome can have death rates between 25% and 50% depending on the region. Health Canada estimates around 200 hantavirus pulmonary syndrome cases occur annually in the Americas, with an average fatality rate of roughly 40%.

COVID-19 has a much lower mortality rate overall — estimated at around 1.1% in Canada — but its rapid and widespread transmission infected millions globally, leading to a far greater total death toll.

In simple terms, hantavirus is deadlier per infection, while COVID-19 spread far more extensively.

Why Experts Say Hantavirus Is Unlikely To Become A Pandemic

Scientists believe hantavirus lacks the characteristics needed to trigger a global pandemic.

Argentine biologist Raul Gonzalez Ittig explained that viruses with extremely high fatality rates often struggle to spread widely because infected individuals become seriously ill quickly, allowing authorities to isolate cases and interrupt transmission chains early.

Because hantavirus rarely spreads between humans and is usually linked to environmental exposure rather than community transmission, outbreaks tend to remain isolated and easier to contain.

Treatment And Prevention

Neither disease has a universally effective cure.

There is currently no widely approved antiviral treatment for hantavirus. Patients rely mainly on supportive medical care, including oxygen therapy, fluids, and mechanical ventilation in severe cases.

The major difference lies in vaccination. COVID-19 has several highly effective vaccines available worldwide that significantly reduce severe illness and death. No licensed hantavirus vaccine currently exists globally, although experimental vaccines are under development.

Preventing hantavirus mainly involves reducing exposure to rodents by storing food securely, ventilating closed spaces, and avoiding contact with rodent droppings, urine, or nesting materials.