I had a bad experience on a cruise a few years ago, finished up in ships hospital severely dehydrated. I turned out to be Gastro enteritus.
Interestingly I came across a leaflet they gave me at the time about these sort of bugs. Apparently Norovirus is the second most common ailment next to the common cold.
I found this info searching my medical file as I had just been rushed into A&E with severe dehydration again (See recent post of mine) following vicious vomiting and diarrhoea.
A 'stool' sample showed no virus! good news in a way but I would like to know what caused it.
I had a colonoscopy the day before but felt fine when I got back home.