An outbreak of the rare but highly deadly hantavirus on a cruise ship is causing international alarm, as authorities scramble to trace those who may have been exposed in a bid to curb its spread. The World Health Organization says that to date, there are eight cases of hantavirus infection linked to the MV Hondius , which is currently en route to the Canary Islands . Three passengers who boarded the Hondius have died, one of whom was confirmed infected. Dr. Tedros Adhanom Ghebreyesus, the WHO’s