A cluster of hantavirus cases struck the Dutch-flagged cruise ship MV Hondius as it traveled across the southern Atlantic, stopping at a number of destinations along the way. Public health authorities' investigations are ongoing. Gaps in knowledge are expected during an unfolding investigation, and as those gaps are filled, we will update you here. The cluster of hantavirus cases began on the Dutch-flagged MV Hondius cruise ship, which set off from southern Argentina on April 1 carrying some 150 people, including 17 from the United States . So far, there have been five confirmed cases of hantavirus linked to the outbreak, according to the World Health Organization (WHO). Three people have died after being on board the ship during the outbreak, although not all the deaths have been confirmed to have been infected with hantavirus. At least five people linked to the outbreak are receiving medical treatment in hospitals. The ship stopped at a number of destinations along the way.…