The hantavirus outbreak exposes shortcomings in international health preparedness

The hantavirus  outbreak detected on the expedition cruise ship ‘MV Hondius‘ has highlighted the 
ongoing difficulties in responding to rare diseases when they occur in confined spaces and with international travel. German researchers warn that this episode reveals a global health “preparedness gap” for zoonoses capable of causing cross-border public health problems on ships with limited medical resources.

The scenario, experts explain, multiplies the complexity of health control: passengers from different countries, continuous cohabitation in confined spaces, limited medical assistance on board, and subsequent international dispersal of exposed individuals. This is the view of Thirumalaisamy P. Velavan, a researcher in infectious diseases, tropical medicine, and molecular genetics at the Institute of Tropical Medicine of the University of Tübingen, and Jonas Schmidt-Chanasit, a virologist at the University of Hamburg and head of the Arbovirology Department at the Bernhard Nocht Institute for Tropical Medicine, in a perspective published in the International Journal of Infectious Diseases.

The publication coincides with the ongoing international operation to address the outbreak linked to the MV Hondius, which arrived last Sunday at the port of Granadilla in Tenerife, where passengers and some crew members subsequently disembarked and were repatriated. According to the latest update from the World Health Organization ( WHO ), confirmed again this Thursday, eleven cases have been reported, including three deaths: eight confirmed cases of Andes virus infection, two probable cases, and one inconclusive case pending further testing. The WHO maintains that the risk to the global population is low.

Velavan and Schmidt-Chanasit’s analysis argues that this episode reflects a broader problem: the difficulty of detecting, investigating, and controlling rare zoonoses when they occur on expedition trips with travelers from various countries, prolonged cohabitation in enclosed spaces, and limited health capacity during the journey.

Difficulties in detecting and tracing cases

Researchers emphasize that this type of outbreak creates “ specific diagnostic, clinical, and epidemiological challenges.” On an expedition cruise, the initial symptoms can be mistaken for other respiratory infections or fevers, and onboard diagnostic capabilities are limited.

Added to this is another problem: contact tracing. The authors explain that tracking becomes even more complicated when passengers disembark or return to their countries of origin after completing their trip.

Experts also point out that the Andes virus “is unique among hantaviruses” because, unlike others, “it has a documented limited capacity for human-to-human transmission ,” especially through close and prolonged contact. The WHO also notes in its update that, based on available information, the working hypothesis suggests that “ the first case may have acquired the infection before boarding through exposure on land ” and that current evidence suggests subsequent transmission among people on board the ship, although investigations are ongoing.

Difficulties in detecting and tracing cases

Researchers emphasize that this type of outbreak creates “ specific diagnostic, clinical, and epidemiological challenges.” On an expedition cruise, the initial symptoms can be mistaken for other respiratory infections or fevers, and onboard diagnostic capabilities are limited.

Added to this is another problem: contact tracing . The authors explain that tracking becomes even more complicated when passengers disembark or return to their countries of origin after completing their trip.

Experts also point out that the Andes virus “is unique among hantaviruses” because, unlike others, “it has a documented limited capacity for human-to-human transmission ,” especially through close and prolonged contact. The WHO also notes in its update that, based on available information, the working hypothesis suggests that “ the first case may have acquired the infection before boarding through exposure on land ” and that current evidence suggests subsequent transmission among people on board the ship, although investigations are ongoing.