The risk of hantavirus spreading from the outbreak linked to a cruise ship is "essentially zero", a top expert has said.Professor Sir Andrew Pollard, director of the Oxford Vaccine Group at the University of Oxford, said that the virus is "rarely" spread between people.

The risk of hantavirus spreading from the outbreak linked to a cruise ship is "essentially zero", a top expert has said.Professor Sir Andrew Pollard, director of the Oxford Vaccine Group at the University of Oxford, said that the virus is "rarely" spread between people.