As countries around the world work to safely quarantine passengers who were on board the cruise ship at the heart of a deadly hantavirus outbreak, authorities are urgently working to trace the outbreak's origins.Eight cases have been linked to the outbreak that has killed three people, after the rare, rodent-born virus was detected last week on Dutch cruise ship the MV Hondius The World Health Organization (WHO) has said that while it does not expect the hantavirus cluster to trigger a global outbreak, authorities are still eager to know how the virus made its way onto the ship.Eyes have fallen on Argentina, where the Dutch couple who first fell ill — and later died — boarded the cruise.The virus is endemic in parts of the country, with the country's Ministry of Health reporting 101 infections since July last year.The Australian government has since updated its travel advice for the country, saying the virus "continues to be a risk in Argentina" but advising travellers to exercise normal safety precautions.Despite being endemic in parts of the world, the outbreak's origin has become contentious, with local authorities in one part of Argentina accusing the country's government of scapegoating the town