CORONAVIRUS | A study by French scientists which suggests a man was infected with Covid-19 as early as Dec 27, nearly a month before France confirmed its first cases, could be important in assessing when and where the new coronavirus emerged, experts said on Tuesday.

French researchers led by Yves Cohen, head of resuscitation at the Avicenne and Jean Verdier hospitals, retested samples from 24 patients treated in December and January who had tested negative for flu before Covid-19 developed into a pandemic...