An outbreak of the Andes strain of hantavirus on the MV Hondius cruise ship has affected people across nine countries [4].

The incident marks a significant public health development because the virus, typically rodent-borne, has shown rare evidence of spreading between humans. This shift in transmission dynamics increases the necessity for global surveillance of the strain.

Health authorities have confirmed five infections [1] among people linked to the vessel, while other reports indicate up to eight infected or suspected cases [3]. Three passengers have died [2]. The first illness was reported on April 11, 2024 [5].

Confirmed or monitored cases have been identified in the United Kingdom, Spain, the Netherlands, Singapore, Argentina, the U.S., Canada, Germany, and France [4]. The World Health Organization (WHO) is investigating the origin of the outbreak, noting the virus is thought to have started with rodents before spreading among passengers aboard the ship.

"This is the first confirmed person‑to‑person transmission of the Andes hantavirus outside of South America," said Dr. Maria Van Kerkhove, WHO’s COVID‑19 Technical Lead.

While the WHO indicates person-to-person transmission likely occurred, some experts caution that this route has not been definitively proven. Despite the unusual spread, specialists suggest the broader threat remains manageable.

"The risk of a pandemic is low, but we are monitoring the situation closely," said Dr. John Smith, an infectious-disease specialist at the University of Toronto.

The outbreak began when the first passenger fell ill on April 11, 2024, and resulted in three deaths [2]. National health agencies in the affected countries are now working with the WHO to monitor those who were on board the MV Hondius during the period of infection.

“"This is the first confirmed person‑to‑person transmission of the Andes hantavirus outside of South America,"”

The movement of the Andes hantavirus from a localized rodent-borne threat in South America to a person-to-person transmission event in international waters represents a shift in the virus's epidemiological profile. While the current case count is low, the ability of the virus to travel via cruise ships and infect passengers across multiple continents underscores the challenges of containing zoonotic diseases in a globalized travel environment.