COVID-19 cases rose by over 20% week-on-week in nearly two dozen African countries and progress on vaccinating Africans is proceeding slowly, with just 0.79% of people on the continent fully vaccinated, senior health officials have disclosed. "Africa is in the midst of a full-blown third-wave...We've seen in India and elsewhere how quickly COVID-19 can rebound and overwhelm health systems," Matshidiso Moeti, WHO regional director for Africa, told a news conference. New cases are up nearly 30% in the past week and deaths are up by 15%, she said, with five countries -- South Africa, Tunisia, Zambia, Uganda and Namibia --…