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.
the source of the outbreak is the black plague
( z1 disease :name ( z2 name :op "Black" :op "Plague" ) :ARG0-of ( z3 cause :ARG1 ( z4 outbreak ) ) )