Mark Woolhouse

"In my view it is premature to conclude, on the basis of the evidence currently available (as of 29 January 2020), that the new (COVID-19) virus can be transmitted before symptoms appear."

"Those (anyone who returns from Wuhan being isolated for 14 days with all necessary medical attention) are the sorts of measures that will protect countries from the introduction of the (COVID-19) virus and onward transmission. There's always a balance between the draconian measures of public health and what people might want to do, and obviously it's regrettable if people who turn out not to have the virus are quarantined unnecessarily."