Cases of hantavirus, the term for a group of viruses carried by infected rodents that can pose a severe disease risk in humans, emerged on luxury cruise ship MV Hondius last month.
The vessel had been marooned in quarantine off the coast of Cape Verde in West Africa since Sunday

Australians on board a luxury cruise ship hit by a deadly hantavirus outbreak will have to wait on the vessel, despite other passengers departing, as they await a flight home.
The four Australian citizens, one permanent resident and a New Zealand national are expected to leave the Canary Islands, where passengers have finally begun to disembark, later today and touch down in Perth on Tuesday.
A federal government spokesperson said Department of Foreign Affairs and Trade consular officers in Tenerife and Canberra had been closely coordinating the response while the Commonwealth and states are working through health and transport arrangements.