The World Health Organization (WHO) Wednesday called for a moratorium on COVID-19 booster shots until the end of next month to address a shortfall in vaccines for poorer countries. “I understand the concern of all governments to protect their people from the Delta variant, but we cannot and should not accept countries that have already used most of the global supply of vaccines using even more of it while the world’s most vulnerable people remain unprotected,” WHO Director-General Tedros Adhanom Ghebreyesus told a news conference on Wednesday. As a result, he said, the organization wants a “moratorium on boosters” until the end of September at the very least to make sure that 10 percent of every country’s population has received a dose. More than 80 percent of the world’s vaccine supplies have gone to more wealthy countries for less than half the world’s population. Previously, WHO officials have warned that …