At a briefing on the global COVID-19 situation today, the head of the World Health Organization (WHO) credited stringent measures in countries for a decline in cases over the past 4 weeks, but he warned that complacency is as dangerous as the virus.In another encouraging trend, deaths have fallen for the second week in a row, said Tedros Adhanom Ghebreyesus, PhD, the WHO's director general. "Every life that is lost now is all the more tragic as vaccines are beginning to be rolled out."He urged countries to keep their COVID-19 measures in place and for individuals to keep their guard up.WHO looks ahead to China mission report, 'long COVID' guidanceIn other updates, Tedros said the international joint mission team that just returned from