CDC definition : “Noroviruses (genus Norovirus, family Caliciviridae) are a group of related, single-stranded RNA, nonenveloped viruses that cause acute gastroenteritis in humans. Norovirus was recently approved as the official genus name for the group of viruses provisionally described as “Norwalk-like viruses” Succinctly, get a norovirus and barf your guts out. I’m not a fan of ralphing. I do not worship at the temple of the porcelain god. The idea of taking a vacation and spending 24-48 hours with my arms wrapped around a toilet just seems horribly, horribly wrong. Consequently I have great sympathy for the poor folks who did just that on several recent cruises. Mercury as an example. The record-holder for bad trips in 2009 was Holland America . Its fleet delivered seven different outbreaks on five different boats. According to an article in the AARP magazine, (Yeah, embarrassingly enough I read it but just for the pictures.), Holland America spent a whopping 5