Carnival Corp includes Seabourn, Cunard, Windstar and HAL... which are all quite different from the "Carnival" Norm talks about.
I actually was referring to the whole company. Within the past few months, MS Amsterdam had outbreaks of Norwalk Virus on a dozen consecutive cruises (which is a fairly obvious indication that they were not sanitizing the ship adequately during turn-around) and finally did something about the problem only when the CDC threatened to get nasty, a fire aboard the sail ship Wind Song caused emergency evacuation of passengers during a cruise and a total loss of the vessel, and RMS Queen Elizabeth II failed sanitation inspection by the CDC.
While the ships of Seaborne Cruises have not gained press for these incidents, Carnival Corporation did merge Seaborne Cruises and Cunard Lines Ltd. into a single entity. Objectively, therefore, they are a single entity for statistical purposes.