The World Health Organization has declared a rare hantavirus outbreak linked to a cruise ship officially over, closing the book on a cluster that spread anxiety across dozens of countries earlier this year. The announcement came after the last known contact of an exposed person completed quarantine without falling ill.
The declaration hinged on that final case clearing its monitoring period. The WHO said the last contact completed quarantine, tested negative and returned home, and that no further cases had been reported since May 25, allowing health officials to consider the transmission chain broken.
The human cost of the outbreak was significant given its rarity. In all, there were 13 cases, 12 of them confirmed and one classified as probable, and three deaths, at least two of which were confirmed as linked to the virus.
The cluster was traced back to a single voyage. The outbreak began aboard the MV Hondius, a Dutch-flagged cruise ship, after it departed southern Argentina on April 1, seeding infections that would later be detected among passengers and their contacts far from where the trip began.
The pathogen involved was an unusual one. Officials identified the rare Andes hantavirus strain, which typically circulates in Argentina and Chile, as the cause, a strain that has drawn particular scientific attention because of its behaviour compared with other hantaviruses.
The response stretched around the globe. More than 650 contacts were identified and followed up by health authorities in 33 countries and territories, an extensive tracing effort that reflected how widely the cruise ship's passengers had dispersed after disembarking.
Hantaviruses are generally spread to people through contact with infected rodents and their droppings, and they can cause severe respiratory illness. The Andes strain at the centre of this outbreak is notable among hantaviruses because limited person-to-person transmission has been documented, which helped explain the intensive contact tracing.
With the quarantine period complete and no new infections emerging, the WHO moved to formally close the episode. Health authorities across the affected countries had spent weeks watching for further cases, and the all-clear brought a quiet end to a scare that had briefly rippled through the global travel world.