Cruise Ship Outbreak in April 2026

An outbreak of Andes hantavirus aboard the MV Hondius, a Dutch expedition vessel carrying 147 people from 23 countries, confirmed ongoing risks of disease transmission at sea. The virus, one of several hantaviruses, can spread between people but is not highly contagious. Eleven cases and three deaths resulted from the outbreak reported as of May 14.

Historically, controlling disease on ships has shaped public health practices. In 1377, Ragusa—now Dubrovnik, Croatia—ordered ships arriving from plague-affected ports to wait offshore.

Venice later established the first permanent quarantine island in 1423. These early practices relied on enforceable authority over vessels.

Modern disease control moved from harbor quarantine to international frameworks like the World Health Organization, established in 1948. However, the 2020 COVID-19 outbreak on the Diamond Princess and the recent Hondius case reveal challenges coordinating responses, especially as the cruise industry expands into remote regions. The United States’ withdrawal from the WHO in January 2026 further complicates international cooperation, potentially slowing outbreak responses.