A suspected hantavirus outbreak on a cruise ship in the Atlantic Ocean has killed three people and sickened six others, according to the World Health Organization. One case has been confirmed in a laboratory, and five others are under investigation, with three fatalities reported.

Outbreak details and response

According to the World Health Organization, detailed investigations are ongoing, including further laboratory testing, epidemiological studies, and virus sequencing; the WHO has deployed technical support to contain the situation and identify the source of the outbreak. Affected passengers and crew members are receiving medical attention and are under observation to prevent further spread.

Of the six individuals who have shown symptoms consistent with hantavirus infection, three have died, but One remains in critical condition in an intensive care unit in South Africa. The WHO has not disclosed the nationality of the affected individuals.

Transmission and symptoms

Hantavirus is primarily transmitted through contact with infected rodents or their urine, saliva, or droppings; the risk increases when these materials are disturbed and become airborne, allowing the virus to be inhaled. In rare cases, hantavirus can spread between people.

Symptoms of hantavirus infection often begin with flu-like signs such as fever, chills, muscle aches, and headaches, In more severe cases, the illness can progress rapidly, leading to severe respiratory distress as fluid accumulates in the lungs. According to the U.S. Centers for Disease Control and Prevention, symptoms can appear anywhere from one to eight weeks after exposure.

A related condition, hemorrhagic fever with renal syndrome, typically develops within one to two weeks and affects the kidneys, Fatality rates vary depending on the strain of the virus.

Historical context and U.S. cases

Hantaviruses have existed for centuries, with outbreaks historically reported in Asia and Europe, where infections have been linked to hemorrhagic fever and kidney failure — In the United States, a distinct strain emerged in the early 1990s, causing a severe respiratory illness known as Hantavirus Pulmonary Syndrome.

The U.S. Centers for Disease Control and Prevention began tracking the virus after a 1993 outbreak in the Four Corners region, the area where Arizona, Colorado, New Mexico, and Utah meet. The disease gained attention in the U.S. in 2024 when the wife of late actor Gene Hackman died from a hantavirus infection in New Mexico.

While most U.S. cases occur in Western states, the recent cruise ship outbreak highlights the global nature of the threat and the need for continued surveillance and response strategies in international travel settings.