90-Second Read: Cruise ship plays a crucial role in the Hantavirus outbreak

According to Disease Outbreak News, which was published by the World Health Organization (WHO) on 13 May, there have been 11 total cases of Hantavirus originating from the cruise ship Hondius, eight of which have been confirmed to be the Andes strain (ANDV). This outbreak is unusual because Hantavirus is usually transmitted from rodent faeces and is not usually capable of person-to-person transmission, unless it is ANDV and there is prolonged close contact. The working hypothesis presented in Disease Outbreak News is that patient zero acquired Hantavirus from a zoonotic exposure and then boarded the Hondius. In a May 2026 publication in Travel Medicine and Infectious Diseases, researchers noted that there is a gap in existing outbreak prevention regarding zoonotic and environmental exposures.

Additionally, the food and water supply is shared, which has been connected to other cruise-specific outbreaks such as norovirus and Legionella pneumophila. While this specific disease is rare, the outbreak highlights the possibility that infectious agents can enter the ship environment through boarding. In the future, zoonotic transmission events are likely to be included in cruise ship outbreak protocols, including containment and reporting. There have also been three deaths, yielding a fatality rate of 27%.

The most apparent risk factor for transmission on a cruise is the closed environment of the ship. Each of these locations has the potential to either spread an onboard infection to land or the reverse. Public health measures have been enacted to interrupt the transmission of the ANDV outbreak. This is due to the wide incubation period range, which is anywhere from one to eight weeks post-exposure for Hantavirus pulmonary syndrome (HPS).

This creates the conditions necessary for ANDV to spread, which does not generally occur on land. The WHO guidelines state that high-risk contacts should be put on active monitoring and quarantine for 42 days following exposure. The Hondius stopped at Antarctica, South Georgia, Nightingale Island, Tristan da Cunha, Saint Helena, and Ascension Island.