The international health community is closely monitoring a developing hantavirus cluster linked to the M/V Hondius, a Dutch-flagged cruise ship. As of mid-May 2026, health authorities have reported a series of severe respiratory illness cases among passengers, prompting coordinated responses from the World Health Organization (WHO) and the United States Centers for Disease Control and Prevention (CDC).
According to the latest situational report from the World Health Organization, the outbreak has resulted in a significant case fatality ratio. As of May 13, 2026, a total of 11 cases have been reported, including eight laboratory-confirmed cases of Andes virus (ANDV) infection. Of these 11 cases, three deaths have been recorded—two confirmed and one probable—representing a 27% case fatality ratio.
The cluster was initially brought to the attention of the WHO on May 2, 2026, following a notification from the United Kingdom regarding severe acute respiratory illness aboard the vessel. Since that initial report, additional cases have been identified in France and Spain, while one case in the United States remains inconclusive and is undergoing further testing.
The Clinical Profile: Understanding the Andes Virus
What distinguishes this outbreak from many other hantavirus incidents is the specific strain identified: the Andes virus (ANDV). While most hantaviruses are transmitted to humans through contact with infected rodents—specifically through exposure to their urine, droppings, or saliva—the Andes virus possesses a unique epidemiological characteristic.
As noted by the Centers for Disease Control and Prevention, the Andes virus is the only type of hantavirus currently known to be capable of person-to-person transmission. This transmission is typically limited to individuals who have had close contact with an infected person, a factor that necessitates rigorous monitoring and contact tracing among the passengers of the M/V Hondius.
Hantaviruses generally manifest in two distinct clinical syndromes:
- Hantavirus Pulmonary Syndrome (HPS): Primarily found in the Western Hemisphere, including the United States, this syndrome affects the lungs and can be severe or fatal.
- Hemorrhagic Fever with Renal Syndrome (HFRS): A group of clinically similar illnesses caused by hantaviruses found mostly in Europe and Asia.
The symptoms of HPS typically emerge between one and eight weeks after exposure. Early clinical indicators include fatigue, fever, and muscle aches, particularly in large muscle groups such as the thighs, hips, back, and shoulders. Approximately half of all HPS patients also report headaches, dizziness, chills, and gastrointestinal issues such as nausea, vomiting, diarrhea, and abdominal pain. As the illness progresses—usually four to 10 days after the initial phase—patients may experience more critical symptoms, including coughing and shortness of breath.
The U.S. Government Response and Repatriation Plan
The United States government has mobilized a multi-agency response to manage the impact on American citizens aboard the cruise ship. The CDC has emphasized that while the situation is being managed with high priority, the risk to the American public remains extremely low.
To ensure the safety of impacted American passengers, the U.S. Government is coordinating a medical repatriation effort. According to a CDC media release, the repatriation process will follow a specific medical protocol:
- Deployment to the Canary Islands: The CDC has deployed a specialized team of epidemiologists and medical professionals to the Canary Islands, where the M/V Hondius is expected to dock. This team will conduct individual exposure risk assessments for every American passenger to determine the necessary level of medical monitoring.
- Medical Repatriation Flight: Impacted passengers are scheduled to be evacuated via a U.S. Government medical repatriation flight.
- Arrival at Offutt Air Force Base: The flight will land at Offutt Air Force Base in Omaha, Nebraska.
- Transfer to Specialized Care: From Offutt AFB, passengers will be transported to the National Quarantine Center at the University of Nebraska, Omaha, for continued observation and assessment.
An additional CDC team is being deployed to Offutt Air Force Base to support the public health assessment of all returning passengers, ensuring that the transition from the vessel to U.S. Soil is managed with strict adherence to infectious disease protocols.
Global Risk Assessment and Public Health Safety
Despite the severity of the individual cases and the high fatality ratio reported among the cruise ship passengers, international health bodies are not currently signaling a broader global threat. The WHO has assessed the risk posed by this specific event to the global population as low. The organization continues to monitor the epidemiological situation and will update its risk assessment as new data becomes available.
International health regulations are being strictly followed, with National IHR Focal Points (NFPs) providing support for international contact tracing efforts. This collaborative approach is designed to contain the virus within the known cluster and prevent further transmission.
Key Takeaways for the Public
- Current Risk: The risk to the general public is considered extremely low by both the CDC and the WHO.
- Transmission: While most hantaviruses are rodent-borne, the Andes virus (ANDV) identified in this cluster can spread through close person-to-person contact.
- Symptoms to Watch: Early symptoms include fever, fatigue, and muscle aches, progressing to respiratory issues like shortness of breath.
- Official Monitoring: The CDC and WHO are actively managing the situation through international partnerships and specialized medical deployments.
FAQ: Hantavirus and the M/V Hondius Outbreak
How did the passengers get infected?
While the exact source of the outbreak on the M/V Hondius is still under investigation by epidemiologists, hantaviruses are typically spread via contact with infected rodents. However, because the Andes virus is involved, medical professionals are also monitoring for person-to-person transmission among those in close contact with ill passengers.
Is there a vaccine for hantavirus?
The provided official reports from the CDC and WHO do not mention the availability of a vaccine for hantavirus. management currently focuses on monitoring, exposure assessment, and clinical care.
What is the difference between HPS and HFRS?
Hantavirus Pulmonary Syndrome (HPS) primarily affects the lungs and is more common in the Western Hemisphere. Hemorrhagic Fever with Renal Syndrome (HFRS) is a group of illnesses that primarily affects the kidneys and is more common in Europe and Asia.
What happens next in the repatriation process?
The next critical phase involves the arrival of the M/V Hondius in the Canary Islands, where the CDC epidemiological team will begin individual risk assessments for all American passengers before they are cleared for the medical repatriation flight to Nebraska.
The situation remains developing. We will provide updates as official reports from the CDC and WHO are released.
Have questions about recent infectious disease outbreaks? Share your thoughts or questions in the comments below, and please share this article to keep your network informed.