PARIS — Over 1,700 passengers and crew on a British cruise ship were ordered to remain on board after an outbreak of gastrointestinal illness, French authorities said Wednesday. They dismissed any link to a deadly hantavirus outbreak on another vessel that has put European health authorities on alert. The Ambition was midway through a 14-night cruise from Belfast and Liverpool that was due to take in ports in northern Spain and along France’s Atlantic coast. It reached Bordeaux on Tuesday evening, according to the operator, Ambassador Cruise Line. The U.S. Centers for Disease Control and Prevention recorded 16 gastrointestinal outbreaks on cruise ships in 2024, the highest total in more than a decade. Most were caused by norovirus, and the recent surge has been linked to a new strain of the highly contagious virus. The prefect of Nouvelle-Aquitaine region and Gironde department, Étienne Guyot, suspended disembarkation from the Ambition and restricted the vessel’s interactions with the port of Bordeaux.…