A cruise ship docked in Bordeaux, France was placed under quarantine May 12 after about 50 passengers developed norovirus symptoms and one 90-year-old passenger died from a suspected gastroenteritis-related illness. Authorities held the 1,700+ passengers and crew from disembarking while investigating, though passengers showing no symptoms were later allowed to leave. This is a standard public health response to prevent spread of a highly contagious virus — norovirus spreads rapidly in confined spaces like cruise ships but is typically mild in healthy people.