Three patients, including a British doctor, were airlifted from the hantavirus -stricken cruise ship to receive specialist medical care on Wednesday.  A total of eight suspected cases of the deadly disease have now been linked to the MV Hondius, with five of those cases now confirmed by the World Health Organisation (WHO). There have been three deaths among passengers aboard the luxury cruise ship, which is currently sitting off Cape Verde as it awaits sail to Spain's Canary Islands . While the cause of the outbreak is unconfirmed, two Argentine officials investigating the origins said the government's leading hypothesis was that a Dutch couple contracted the virus during a bird-watching tour in Ushuaia, Argentina.  They said the couple visited a landfill during the trip, where they may have been exposed to rodents carrying the infection. Health authorities have maintained that the risk to global health is low.…