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>>>a stomach turning experience for hundreds of people aboard a
cruise ship
. today, the
explorer of the seas
was in
st. thomas
and the
u.s. virgin islands
where the officials from the centers of
disease control
were looking into the outbreak of a highly contagious
stomach virus
. more tonight from gabe
gutierrezgutierrez
.

>> reporter: today, health officials from the
centers for disease control
boarded a
cruise ship
, struggling to contain a
norovirus
outbreak.

>>i was one of them.

>>she was one of them.

>>it was awful.

>> reporter: vomiting and diarrhea symptoms.

>>it was a terrible experience. i've been on this boat before. we had an amazing time when we were here. this time, it's just been awful.

>> reporter: after departing new jersey on tuesday, the ship bypassed a planned stop in haiti friday to be san advertised in
puerto rico
before moving on to
st. thomas
. sao panto, the mayor of eastern pennsylvania is on board, vacationing with his wife. he is not sick, but says other passengers have been quarantined in their rooms.

>>lot of activity with cleaning and san advertising the various railings and elevator shafts.

>> reporter: norovirus
is a fast-moving stomach bug. each year, the cdc says it sickens 21 million people in the u.s. and kills up to 800. just this month, dozens of travelers got sick on another
royal caribbean
cruise.

>>norovirus
can spread very readily from person to person. when you have people confined, the spread can be quick and explosive.

>> reporter: royal caribbean
says sick passengers were responding well to over-the-counter medications. we sincerely apologize for this disruption to our guests' cruise vacation.

>>hopefully, we'll have a good ride going back.

>> reporter: tonight the
explorer of the seas
is scheduled to leave
st. thomas
, on its way to
st
. maarten as health officials try to get rid of an unwelcomed guest. gabe
gutierrez
, nbc news, atlanta.