According to numerous news sources, Royal Caribbean’s Quantum of the Seas has a COVID-19 case aboard the ship. The captain reportedly announced the news late last night (video below). The cruise ship ship is now returning to Singapore where the guests and crew will be quarantined.
The cruise was touted as allegedly

The Center for Disease Control and Prevention (CDC) is reporting that there is a gastrointestinal outbreak on the Silver Shadow operated by the Silversea Cruises company.
A passenger sailing on a Holland America Line (HAL) cruise ship near Greece contacted me today, stating that a number of guests are experiencing gastrointestinal symptoms:
The
The Centers for Disease Control and Prevention (CDC) reports that there was an illness outbreak on Fathom’s Adonia this past week (October 16 – October 23, 2016).
Yesterday we received information about the current cruise of the Oceania Rivieria which is sailing through the Caribbean (Miami March 20-April 3). "The captain came on the intercom yesterday informing the passengers that a large number of passengers had come down with flu like/gastrointestinal issues and the CDC had been informed. The ship ported at their first stop Santa Marta
Earlier this week, we reported that health officials banned the Norwegian Gem from calling on St. Maarten because a number of passengers were ill with a gastrointestinal illness. The NCL cruise ship then sailed on to Tortola where it called on the port there.
Cruise Critic
Cruise passengers on the Fred Olsen Balmoral cruise ship are affected by a massive viral outbreak.