The Tour de France stepped up protective measures, to "limit health risks" in the face of a resurgence of Covid-19, which has affected several riders in recent days. Masks must now be worn by everyone, including organisers, guests and journalists, who may be "in contact with the riders and members of the cycling teams" before and after the stages, said organisers Amaury Sport Organisation (ASO). Several riders, including Britain's Tom Pidcock and Spain's Juan Ayuso, team-mate of yellow jersey Tadej Pogacar, have already retired after testing positive. Pogacar said before the start of the race that he had been affected...