Controlling illness on cruise ships is a challenge. Over the past 4 years, there have been 10 or so ships that meet the conditions for reporting by CDC (CDC Outbreak Updates for International Cruise Ships). But in order to report by CDC, there is a cutoff - "3% or more of passengers or crew reported symptoms of diarrheal disease to the ships medical staff during the voyage." So in the recent outbreak on the Ovation, it just made that mark at 3.3% on board ill.
This table shows the other cases in the last 6 months.
Gastro outbreak on Ovation of the Seas cruise ship, almost 200 ill
By Natalie Whiting
Updated 5 Dec 2017, 2:04amTue 5 Dec 2017, 2:04am