Health officials believe a rare strain of hantavirus that spreads from person-to-person and has a 40% mortality rate is responsible for the outbreak on the MV Hondius cruise ship that has killed three passengers , and sickened seven others. Though hantavirus is typically only spread through rodent droppings, this particular strain is an alarming exception – and it’s one that “can’t be ruled out,” the World Health Organization conceded Tuesday. Authorities in Cape Verde, for their part, said they had not allowed the Dutch-flagged ship to dock as a precaution, citing the “aim of protecting national public health.” via REUTERS The outbreak was reported aboard the MV Hondius cruise ship during its journey between Argentina and Cape Verde. REUTERS So far, no one has yet been allowed to disembark, the company operating the cruise said.…