A second wave of coronavirus could be "more severe" than the first and may spread more rapidly if it arrives in winter, England's chief medical officer has warned.
Every country seeking to ease lockdown measures now must negotiate an "extremely difficult balancing act" to keep the pandemic under control, Professor Chris Whitty said in an online Gresham College lecture.
In particular, the virus reproduction "R" number must be kept below one - meaning each infected person could expect to pass it to fewer than one other person on average.
Prof Whitty said: "We need to make sure that R does not go back above one. Because if not we will go back to a second wave. "It is entirely plausible for a second wave to actually be more severe than the
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