Preliminary tests identified the source of the outbreak as the highly contagious norovirus, which had struck several guests just before they boarded the cruise Nov. 3 in Rome, Carnival officials said.
People were sick on the ship.
The virus broke out on the ship.
( z0 sick :ARG1 ( z1 person ) :location ( z2 ship ) )
(z0 / sick-05
    :ARG1 (z1 / person)
    :location (z2 / ship))
People were sick on the ship .
z0 :ARG1 z1
z0 :location z2