Norovirus spreads easily and often causes vomiting, diarrhea, nausea and stomach pain, although people usually recover in a few days. And the virus has many names — stomach flu, stomach bug and cruise ship virus, although you can also get sick on land.

Eighty-eight people aboard a Holland America cruise ship, the Eurodam, in the Caribbean were sickened in a norovirus outbreak -- the fifth striking the line since early December.

It's the second Holland America Line ship to have dozens of passengers fall ill this month, according to the CDC.