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Hantavirus: What You Need to Know

Our Chief Medical Officer explains the science behind the headlining disease

According to the Center for Disease Control, there are currently no confirmed cases of hantavirus originating in the U.S., and the CDC says that the risk to the public is low.

A message from Dr. Anwar, SVdP's Chief Medical Officer:

Hantavirus has been in the news lately and in many discussions online. I'm writing about it today to address any confusion and misinformation. As a medical professional, I feel it's my duty to help educate and share facts from the medical field. Hopefully, having this knowledge helps dispel any unnecessary fears you might have about hantavirus while practicing good health to avoid exposure, as unlikely as that is.

What is Hantavirus?

Hantavirus is a group of zoonotic viruses that can cause two major clinical syndromes, including hemorrhagic fever with renal involvement and severe cardiopulmonary disease affecting the heart and lungs. Currently, there are no FDA-approved specific antiviral treatments or vaccines. Management is primarily supportive care.

Transmission

Rodents are the primary natural reservoir for hantavirus. Transmission to humans occurs mainly through inhalation of aerosolized viral particles from rodent urine, feces, or saliva, and less commonly through rodent bites. One type of hantavirus, known as the Andes virus, is unique because it can spread from person to person, particularly through close or intimate contact. The virus may remain viable in the environment for several days to more than a week, depending on environmental conditions.

Why Is This Relevant to the News?

The recent deadly outbreak of hantavirus linked to a cruise ship may have originated from a Dutch couple who reportedly contracted the illness during a bird-watching excursion in Argentina. According to authorities, the couple visited a landfill site during the tour, where they may have been exposed to rodents carrying the virus.

Clinical Presentation

The incubation period ranges from approximately 5–50 days, with a median of about 18 days.

Initial symptoms are often nonspecific and may include:

  • Fever
  • Myalgia (muscle aches)
  • Headache
  • Gastrointestinal symptoms such as nausea, vomiting, or abdominal pain

This may rapidly progress to severe disease, including:

  • Acute kidney injury or kidney failure
  • Respiratory failure due to fluid accumulation in the lungs
  • Cardiac dysfunction and worsening heart function

The case fatality rate can approach 40% in severe untreated cases.

Warning Signs to Watch For

Patients should seek urgent medical attention if they develop:

  • Persistent fever
  • Low blood pressure
  • Decreased urine output (oliguria)
  • Shortness of breath
  • Bleeding or bruising related to low platelet counts
Management

Treatment is supportive and may include:

  • Early ICU admission for close monitoring
  • Oxygen support and possible intubation if respiratory failure develops
  • Intravenous fluids with careful monitoring
  • Dialysis in cases of kidney failure

Early recognition and prompt supportive care remain the most important factors in improving outcomes.

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