After six-week surge, Africa#39;s Omicron-driven fourth pandemic wave flattens: WHO “Early indications suggest that Africa’s fourth wave has been steep and brief but no less destabilising. The crucial pandemic countermeasure badly needed in Africa still stands, and that is rapidly and significantly increasing COVID-19 vaccinations. The next wave might not be so forgiving,” WHO Regional Director for Africa Dr. Matshidiso Moeti said.