Hantavirus vs COVID-19: One Deadlier, One More Contagious - Experts Explain

As

global attention shifts to emerging and re-emerging infections, comparisons between Hantavirus and COVID-19 are gaining traction. Hantavirus has recently been detected aboard a luxury cruise ship in the Atlantic Ocean, where three people have so far been killed. Both Hantavirus and coronavirus are RNA viruses capable of causing serious illness, yet they differ significantly in transmission, severity, and public health impact.Also read: Hantavirus Alert: 10 Crucial Facts Everyone Should Know

How do these viruses spread?

According to Dr Mala Kaneria, Consultant Infectious Disease, Jaslok Hospital and Research Centre, the key difference lies in transmission. Hantavirus is primarily spread through rodents. Humans become infected by inhaling aerosolised particles from rodent urine, droppings, or saliva—often in enclosed or poorly ventilated spaces such as warehouses or homes with infestations. Importantly, human-to-human transmission is extremely rare. In contrast, COVID-19 spreads efficiently between people via respiratory droplets and aerosols. Close contact, crowded settings, and asymptomatic carriers have made it highly contagious and capable of causing global outbreaks. “Hantaviruses and coronaviruses are both enveloped RNA viruses capable of causing significant human disease, primarily affecting the respiratory system; however, they have important differences in terms of how they spread, where they come from, their public health impact, and the case fatality,” she said.

Symptoms and clinical differences

Both infections can initially present with flu-like symptoms such as fever, fatigue, and muscle aches. However, their progression and complications differ. Hantavirus Pulmonary Syndrome can develop rapidly, leading to severe breathing difficulty and fluid accumulation in the lungs. Some strains may also cause Hemorrhagic Fever with Renal Syndrome, affecting the kidneys and leading to complications like low platelet count. Meanwhile, COVID-19 has a broader clinical spectrum - from mild or asymptomatic cases to severe pneumonia, acute respiratory distress syndrome (ARDS), and even multi-organ complications. Its severity often depends on age, underlying conditions, and immune status.

Which virus is more deadly?

Experts emphasize that Hantavirus is generally more deadly on a case-by-case basis. Mortality rates for Hantavirus Pulmonary Syndrome can reach 30–40%, making it a serious medical condition when it occurs. However, COVID-19 has a lower overall fatality rate - typically between 0.5 and 2 per cent. Despite this, it has caused far more deaths globally due to its rapid spread and pandemic potential. As Dr AK Shukla, senior Consultant Physician, Kailash Hospital, explains, “Coronavirus has had a far greater global impact because of its high transmissibility, while hantavirus remains rare but severe.”

Pandemic potential: Why COVID-19 dominates

One of the biggest differences lies in pandemic potential. COVID-19 demonstrated how quickly a virus can spread worldwide due to human-to-human transmission, global travel, and asymptomatic cases. On the other hand, Hantavirus has limited spread because it relies on specific environmental conditions involving rodent hosts. This makes widespread outbreaks unlikely.

Should India be worried?

Experts note that there is currently no active public health alert for hantavirus in India. Cases remain extremely rare and often underdiagnosed due to similarities with other tropical infections. “In India, there have been very rare cases that were diagnosed as Hantavirus. One is because it is underdiagnosed, the second is that it can mimic leptospira, scab typhus, and tropical infections like that. But the important thing we need to know here is two syndromes that are the haemorrhagic fever with renal syndrome and the Hantavirus pulmonary syndrome, where in one the kidney is affected, and in the second pulmonary, the lungs get affected,” Dr. Elakkiya, Consultant Pulmonologist, VS Hospitals. Additionally, since hantavirus does not spread between humans, the likelihood of a large-scale outbreak remains low compared to COVID-19.

Prevention and Awareness

Preventive strategies differ for both viruses:

For Hantavirus:

• Avoid contact with rodent droppings or urine
• Maintain cleanliness in living spaces
• Use protective gear while cleaning infested areas

For COVID-19:

• Practice hand hygiene
• Ensure proper ventilation
• Stay updated with vaccinations

In simple terms, Hantavirus represents a high-severity, low-transmission infection, while COVID-19 is a moderate-severity, high-transmission virus with global impact. Rather than focusing on which virus is “more dangerous,” experts stress the importance of awareness, early diagnosis, and preventive care. Understanding how each virus behaves can help individuals take the right precautions and respond effectively if symptoms arise.