WHO says 'catastrophic waves' of new delta variant cases are driven by greed “We’re in the midst of a growing two-track pandemic where the haves and have-nots within and between countries are increasingly divergent.” By Story at a glance Tedros said that anticipated booster shots could exacerbate inequities. “Some countries and regions are actually ordering millions of booster doses before other countries have had supplies to vaccinate their health workers and most vulnerable,” he added. World Health Organization Leader Tedros Adhanom Gebreyesus said Monday that “greed” is driving persistent vaccine inequality as the highly infectious delta variant creates a “catastrophic wave of cases” across the globe.