“What we know typically about hantaviruses, I just want to put this in context, typically the exposure and the infection comes from contact with rodents,” she said.

Hantaviruses are a group of viruses mainly transmitted to humans through contact with infected rodent urine, droppings or saliva. According to global health authorities, infections can lead to serious respiratory or renal conditions , depending on the strain. Cases remain relatively rare but can be severe, with varying fatality rates across regions.

Limited Human-to-Human Spread

While rodent exposure remains the primary source of infection, Vellucci acknowledged that certain strains have shown limited human transmission.

“We have seen with one of the viruses, the Andes virus, that there has been some limited human to human transmission,” she explained.

She noted that such transmission is not widespread and tends to occur only under specific conditions. “Now, I know that means different things to different people, but just to say that is really among very close contacts." 

Health experts confirm that the Andes virus, found mainly in South America, is the only hantavirus known to spread between humans, and even then, transmission is uncommon and typically linked to prolonged close exposure.

Close Contact Risks and Containment Measures 

Vellucci indicated that current assessments suggest transmission may have occurred among individuals in close quarters, such as shared living spaces.

“However, we do believe that there may be some human to human transmission that is happening among the really close contacts, the husband and wife, people who have shared cabins, et cetera,” she said.

She added that precautionary measures are being enforced based on this assumption. “That is why we are operating and working with the ship to make sure that anyone who is symptomatic, anyone caring for patients, is wearing full personal protective equipment.”

Medical teams responding to the situation have reinforced these efforts. “The medical personnel who have boarded the boat have brought additional PPE as well. So that is our working assumption.”

Current Public Health Context

Recent monitoring indicates no widespread global outbreak of hantavirus, but sporadic cases continue to be reported in regions including the Americas , Europe and parts of Asia. Public health agencies stress the importance of rodent control, proper sanitation and avoiding contact with potentially contaminated environments.

Symptoms of hantavirus infection can include fever, fatigue and muscle aches, followed by respiratory distress in severe cases. Early medical attention remains critical for improving outcomes.