FILE - In this file photo dated Tuesday, July 14, 2020, Director General of the World Health Organization, Tedros Adhanom Ghebreyesus, attends the Bastille Day military parade, in Paris. The head of the World Health Organization has appealed Wednesday Aug. 4, 2021, for a moratorium on administering booster shots of COVID-19 vaccines, to ensure doses are available in countries where few people have yet received their first shots. (AP Photo/Christophe Ena, FILE)