Covid-19 vaccine deserts: Some countries have no jabs at all

While the world's wealthier nations have stockpiled coronavirus vaccines for their citizens, many poorer countries are scrambling to secure enough doses, and some, like Chad, have yet to receive any.

At the small hospital where Dr. Oumaima Djarma works in Chad’s capital, there are no debates over which coronavirus vaccine is the best. There are simply no vaccines at all. Not even for the doctors and nurses like her, who care for COVID-19 patients in Chad, one of the least-developed nations in the world where about one third of the country is engulfed by the Sahara desert.