by Louis GENOT with AFP bureaus Agence France Presse Brazilian President Jair Bolsonaro, who has consistently downplayed the risks of coronavirus, announced Tuesday he has tested positive, as the United States — the nation hardest hit by the pandemic — formally launched its withdrawal from the World Health Organization (WHO). The UN health agency meanwhile acknowledged that there was “emerging evidence” of airborne transmission of COVID-19, which has infected nearly 11.7 million people around […]