The Centers for Disease Control and Prevention (CDC) has issued an alert regarding an outbreak of hantavirus on a cruise ship that has claimed three lives and infected at least seven individuals. The agency stated: "The Administration is closely monitoring the situation with U.S. travelers onboard the M/V Hondius cruise ship with confirmed hantavirus. Our top priority remains the health and safety of all U.S. passengers."
Government Response
The Department of State is leading a coordinated, whole-of-government response, including direct contact with passengers, diplomatic coordination, and engagement with domestic and international health authorities. Concerns about a wider outbreak have escalated as passengers who disembarked from the MV Hondius have returned to several countries, including the United States. American passengers are now being monitored in Georgia, California, and Arizona.
CDC Statement
The CDC continued: "As the world's leader in global health security, the US government is using our premier health experts to guide our response to this evolving situation. We are working closely with our international partners to provide technical assistance and guidance to mitigate risk." For Americans, the CDC assesses the current risk as low but urges those on the cruise to follow health officials' guidance to return home safely.
Patient Transfers and Critical Condition
On Tuesday, three patients were flown to Europe for treatment. A fourth infected passenger remains in South Africa in critical condition. Argentine officials noted that a Dutch couple who boarded the MV Hondius had visited a landfill site in Ushuaia to photograph birds, potentially exposing them to rodents carrying hantavirus.
Transmission Risks
Hantavirus is typically spread by inhaling dust from infected rodent droppings, often disturbed during cleaning. However, the World Health Organization (WHO) has warned about possible rare human-to-human transmission on the ship. The strain involved is the Andes virus, which has been linked to previous outbreaks of person-to-person spread.
Dr. Zaid Fadul, a physician and CEO of Bespoke Concierge MD, explained: "Out of all the hantaviruses we know about, only one (the Andes virus) has ever been proven to spread from person to person. Every other hantavirus strain stays in its rodent host and only jumps to humans when we breathe in aerosolized particles from their droppings, urine, or saliva. Andes virus is the exception."
Human-to-human transmission of the Andes strain can occur when an infected person is in the prodromal phase, exhibiting early symptoms like fever, muscle aches, and fatigue. "During this window, the virus is actively replicating in their lungs and salivary glands, and it can be spread through respiratory droplets, saliva, and close contact," Fadul said. "What's genuinely surprising is that viral shedding begins up to two weeks before a person feels any symptoms at all. That pre-symptomatic window is part of why this virus is so hard to contain."
