Donna, I believe there were vaccines in the 90's but this type of virus has mutated. Every time a new ship or itinerary or port is added the virus mutates itself and is one step ahead of us.
The CDC has computer models which are projecting another DNA mutation causing widespread infection, possibly as high as 20-30% of the cruising population with the injection of flowrider H2O strands into the matrix.
The result will be mass enjoyment at a level we haven't anticipated. Some scientists think we can prevent this but most scientists agree that this is part of the natural evolutionary process of life on this planet!!
banker
(my Saturday silly)