Repatriating people from the Diamond Princess cruise ship "is not free from risks," an expert has said.
Paul Hunter, professor in medicine at the University of East Anglia (UEA), said measures aimed at preventing the spread of coronavirus among passengers and crew appear to now be ineffective, given the high number of extra cases reported on the cruise ship in recent days.
David Abel and his wife sally, who live in Woodford Halse near Daventry, have been stuck on the Diamond Princess since the outbreak.
He added: "Given that the safety from infection of remaining passengers and crew cannot be guaranteed, several countries are repatriating their nationals.
Prof Hunter said the rapid spread of infections on board cruise ships is due to the fact passengers come from all over the world, are often elderly and spend most of their time on board indoors mixing with others.
The Government is currently arranging to fly more than 70 Britons off the Diamond Princess, which is quarantined off the coast of Japan.