Why Norwegian Cruise Line, Carnival Corporation, and Royal Caribbean Stocks Got Torpedoed Today

Here's a hint: It was bad enough that Norwegian Cruise stock is down 5.7% in 12:15 p.m. EST trading -- and bad enough to drag down Carnival (4.3%) and Royal Caribbean (6.1%) right beside it. Last but not least -- and disappointingly for all cruise stock investors, I fear -- Norwegian had little to tell us about hoped-for "technical regulations" from the Centers for Disease Control and Prevention (CDC).