Prof John Oxford, a virology expert at Queen Mary, University of London, said: "This doesn't raise too many alarm bells.
"In a family things can spread far more easily than they would spread outside, people share towels and toothbrushes etc.
"If it was somebody who was not related or a nurse or a doctor - that would be a lot more serious."
Prof Ian Jones, from the University of Reading, said: "There is really close contact involved here, it is not 'true' human transmission in the general public.
"Although it is severe, it's not doing anything worse than some other respiratory infections, it's just a new one."
Prof Wendy Barclay, from Imperial College London, said it was wise to keep a close eye on the virus.
"We're an incremental step closer to worrying, but it isn't a worry where we need to say there is a pandemic coming," she said. http://www.bbc.co.uk/news/health-21442519
