Hantavirus Cruise Outbreak: Global Risk Low

Health authorities have confirmed nine cases of hantavirus linked to an outbreak on the MV Hondius cruise ship. The World Health Organization (WHO) has warned that more infections may emerge due to the virus's potential six-week incubation period. The overall risk of hantavirus transmission to the general population is considered "very low." Hantaviruses are naturally found in rodents. Humans can contract the virus through contact with contaminated urine, droppings, or saliva from infected rodents. Activities like cleaning enclosed spaces or working in forestry can increase exposure risk. Human-to-human transmission is rare, though documented among household or intimate contacts, particularly early in the illness.

The European Centre for Disease Prevention and Control (ECDC) is monitoring the situation, advising symptomatic passengers and crew for immediate medical attention. Asymptomatic individuals are asked to quarantine and monitor for symptoms for up to six weeks. Genetic sequencing confirms the identified virus variant is linked to the same infection source and is not new, nor does it appear to spread more easily or cause more severe disease than other Andes viruses.

Hantavirus infections are uncommon globally, with no specific cure; treatment focuses on managing symptoms. Case fatality rates vary significantly by region, from less than 1-15% in Asia and Europe to up to 50% in the Americas. In Europe, 1,885 hantavirus infections were registered in 2023, a decrease from 2,185 in 2022. A notable outbreak in Argentina in 2018-2019 resulted in 34 confirmed infections and 11 deaths.