A cruise ship with some 1,200 people on board has been quarantined in Venezuela because of an outbreak of the new strain of flu.The Ocean Dream docked in Barbados and Grenada in the Caribbean earlier in the week but no one was allowed to disembark after three crew members were reported ill. The H1N1 virus is spreading in Latin America as winter sets in in the southern hemisphere. Argentina has reported 47 new cases pushing the number of infections above 900. Four people have died there, while the bug has killed two in Chile and one in Colombia. Venezuela and a number of other countries have also announced new cases. Last week, the World Health Organisation declared the outbreak to be a pandemic, signalling it is likely to spread even more rapidly worldwide. Authorities in the northern hemisphere are following developments south of the equator carefully, as work continues on finding a vaccine.