And in San Diego, a measles outbreak in 2008 was traced to an unvaccinated 7-year-old boy who contracted the disease in Switzerland and passed it on to 11 other unvaccinated children, including in his family, his school and his pediatrician's office.

WSJ: Where Could The Next Outbreak Of Measles Be?

They vary depending on how the disease was contracted, but symptoms usually occur within seven days.

CNN: Ten things you need to know about anthrax

In the late 1990s, De Preist contracted kidney disease and had to go on dialysis.

NPR: Conductor James DePreist

While no physical injuries have been reported, if a passenger contracted a significant disease, such as hepatitis, from unsanitary conditions on the ship, maritime trial attorney John H. (Jack) Hickey believes physical injury could be argued.

CNN: Five things we've learned about cruising