A cluster of hantavirus cases linked to a central Atlantic cruise ship has prompted regional health authorities in the Caribbean to issue guidance for port and maritime surveillance, even as officials confirm the overall risk of widespread infection across the region remains low. The outbreak, which has already resulted in one death, has centered on the MV Hondius, a cruise vessel that made a stop on the remote Atlantic island of Tristan da Cunha in mid-April, and has drawn coordinated monitoring from global and regional health bodies.
Dr. Lisa Indar, executive director of the Trinidad-based Caribbean Public Health Agency (CARPHA), broke down the contextual factors that keep regional risk muted. Unlike outbreaks in other parts of the world, hantavirus in the Americas is primarily spread by wild field rodents rather than urban rat populations, which naturally limits transmission opportunities. While the pathogen can spread between humans, she noted that such cases are extremely uncommon, with only the Andes strain found in South America carrying a limited potential for person-to-person spread through prolonged, close contact with infected, symptomatic people.
As of the most recent updates, the United Kingdom government has confirmed three of its citizens are linked to the outbreak: two have received confirmed hantavirus diagnoses. One of those patients is now in stable condition in the Netherlands after being evacuated from the vessel earlier this week, while the second remains in intensive care in South Africa following evacuation last month. A third British national on Tristan da Cunha is currently classified as a suspected case. In total, five confirmed cases have been recorded in the outbreak, including one fatality among the cruise’s passengers.
St. Kitts and Nevis officials have also confirmed one of their citizens was aboard the MV Hondius, but have stressed that no confirmed or suspected hantavirus cases have been detected within the country’s borders to date.
Hantavirus is a potentially severe zoonotic disease that jumps to humans from infected rodents, most often through contact with contaminated rodent urine, feces, or saliva. The most common route of infection is inhalation of airborne particles that have been contaminated with rodent excrement from nesting materials. The Andes strain, present in parts of South America, is the only variant with documented person-to-person transmission capacity.
The global public health alert process for the outbreak began on May 2, when the United Kingdom’s International Health Regulations (2005) Focal Point notified the World Health Organization of the respiratory illness cluster affecting passengers and crew of the cruise ship. At that time, one critically ill patient had already received a laboratory-confirmed hantavirus diagnosis. CARPHA received an alert about the emerging situation one day later through its dedicated public health monitoring and information platform.
Given that the Caribbean is the world’s top cruise tourism destination, accounting for roughly 44% of all global cruise traffic and welcoming an estimated 16.3 million cruise passengers annually, CARPHA is urging all its member states to maintain ongoing vigilance against potential imported cases. The agency is advising national authorities to review and reinforce public health protocols and vessel surveillance systems, particularly at ports of entry where international cruise vessels dock.
CARPHA says it remains committed to supporting safe tourism across the Caribbean through enhanced public health surveillance infrastructure. Two of the agency’s key systems, the Tourism and Health Information System and the Caribbean Vessel Surveillance System (CVSS), are designed to deliver early warnings for public health threats tied to tourism accommodation and maritime travel. Dr. Indar explained that these platforms streamline timely information sharing, improve national decision-making, and allow national health authorities to roll out rapid, targeted responses to emerging threats.
To date, the advanced CVSS has already delivered strong results in detecting syndromic (symptom-based) suspected cases before vessels arrive at Caribbean ports. The system has a track record of sharing more than 96% of all cruise ship public health alerts with member states within 24 hours of detection. CARPHA says it will continue close monitoring of the outbreak in partnership with regional and international stakeholders, and will issue new updates to member states and the public as the situation evolves.