The head of emergencies at the World Health Organization (WHO) said on Monday its “best estimates” indicate that roughly 1 in 10 people worldwide may have been infected by the coronavirus – more than 20 times the number of confirmed cases – and warned of a difficult period ahead.Dr Michael Ryan, speaking to a special session of the WHO’s 34-member executive board focusing on Covid-19, said the figures vary from urban to rural, and between different groups, but that ultimately it means “the vast…