The Center of Diseases Controls (CDC) has listed the 19th outbreak of norovirus on a cruise ship this year. Royal Caribbean International’s Serenade of the Seas cruise ship grappled with a norovirus outbreak that has sickened nearly 100 people. The cruise alerted the CDC about the outbreak on Sept. 28, according to Fox 8. MAJOR CRUISE LINE SUSPENDS CARIBBEAN DESTINATION VISITS AMID KIDNAPPINGS, SAFETY CONCERNSOver 90 passengers and four crew members aboard reported being ill during the voyage, according to the CDC. "Close living environments provide lots of opportunities for spread once a norovirus outbreak has started."