by Robin MILLARD GENEVA, Switzerland (AFP) — Twenty mostly African countries have still not vaccinated even 10 percent of their population against Covid-19, the World Health Organization’s vaccine advisers lamented Monday. The Strategic Advisory Group of Experts on Immunisation (SAGE) said the speed of the Covid jab rollout had been “unprecedented”. However, 20 countries — down from 34 in January — had still not managed a 10-percent immunisation rate, Kate O’Brien, the WHO’s vaccines chief, […]